Features • High-performance, Low-power Atmel® AVR® 8-bit Microcontroller (cid:129) Advanced RISC Architecture – 131 Powerful Instructions – Most Single-clock Cycle Execution – 32 × 8 General Purpose Working Registers – Fully Static Operation – Up to 16 MIPS Throughput at 16 MHz – On-chip 2-cycle Multiplier (cid:129) High Endurance Non-volatile Memory segments – 16 Kbytes of In-System Self-programmable Flash program memory 8-bit – 512 Bytes EEPROM – 1 Kbyte Internal SRAM – Write/Erase Cycles: 10,000 Flash/100,000 EEPROM Microcontroller – Data retention: 20 years at 85°C/100 years at 25°C(1) – Optional Boot Code Section with Independent Lock Bits with 16K Bytes In-System Programming by On-chip Boot Program True Read-While-Write Operation In-System – Programming Lock for Software Security (cid:129) JTAG (IEEE std. 1149.1 Compliant) Interface Programmable – Boundary-scan Capabilities According to the JTAG Standard – Extensive On-chip Debug Support Flash – Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface (cid:129) Peripheral Features – Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes – One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture ATmega16 Mode – Real Time Counter with Separate Oscillator – Four PWM Channels ATmega16L – 8-channel, 10-bit ADC 8 Single-ended Channels 7 Differential Channels in TQFP Package Only 2 Differential Channels with Programmable Gain at 1x, 10x, or 200x – Byte-oriented Two-wire Serial Interface Summary – Programmable Serial USART – Master/Slave SPI Serial Interface – Programmable Watchdog Timer with Separate On-chip Oscillator – On-chip Analog Comparator (cid:129) Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection – Internal Calibrated RC Oscillator – External and Internal Interrupt Sources – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby and Extended Standby (cid:129) I/O and Packages – 32 Programmable I/O Lines – 40-pin PDIP, 44-lead TQFP, and 44-pad QFN/MLF (cid:129) Operating Voltages – 2.7V - 5.5V for ATmega16L – 4.5V - 5.5V for ATmega16 (cid:129) Speed Grades – 0 - 8 MHz for ATmega16L – 0 - 16 MHz for ATmega16 (cid:129) Power Consumption @ 1 MHz, 3V, and 25°C for ATmega16L – Active: 1.1 mA – Idle Mode: 0.35 mA – Power-down Mode: < 1 µA Rev. 2466TS–AVR–07/10

Pin Figure 1. Pinout ATmega16 Configurations PDIP (XCK/T0) PB0 PA0 (ADC0) (T1) PB1 PA1 (ADC1) (INT2/AIN0) PB2 PA2 (ADC2) (OC0/AIN1) PB3 PA3 (ADC3) (SS) PB4 PA4 (ADC4) (MOSI) PB5 PA5 (ADC5) (MISO) PB6 PA6 (ADC6) (SCK) PB7 PA7 (ADC7) RESET AREF VCC GND GND AVCC XTAL2 PC7 (TOSC2) XTAL1 PC6 (TOSC1) (RXD) PD0 PC5 (TDI) (TXD) PD1 PC4 (TDO) (INT0) PD2 PC3 (TMS) (INT1) PD3 PC2 (TCK) (OC1B) PD4 PC1 (SDA) (OC1A) PD5 PC0 (SCL) (ICP1) PD6 PD7 (OC2) TQFP/QFN/MLF 0)2) SS)AIN1/OCAIN0/INTT1)XCK/T0) ADC0)ADC1)ADC2)ADC3) B4 (B3 (B2 (B1 (B0 (NDCCA0 (A1 (A2 (A3 ( PPPPPGVPPPP (MOSI) PB5 PA4 (ADC4) (MISO) PB6 PA5 (ADC5) (SCK) PB7 PA6 (ADC6) RESET PA7 (ADC7) VCC AREF GND GND XTAL2 AVCC XTAL1 PC7 (TOSC2) (RXD) PD0 PC6 (TOSC1) (TXD) PD1 PC5 (TDI) (INT0) PD2 PC4 (TDO) 34567CD0123 DDDDDCNCCCC NBoOtTtoEm: pad should 1) PB) PA) P1) P2) PVGL) PA) PK) PS) P be soldered to ground. (INTOC1OC1(ICP(OC (SC(SD(TC(TM (( Disclaimer Typical values contained in this datasheet are based on simulations and characterization of other AVR microcontrollers manufactured on the same process technology. Min and Max values will be available after the device is characterized. ATmega16(L) 2 2466TS–AVR–07/10

ATmega16(L) Overview The ATmega16 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega16 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power con- sumption versus processing speed. Block Diagram Figure 2. Block Diagram PA0 - PA7 PC0 - PC7 VCC PORTA DRIVERS/BUFFERS PORTC DRIVERS/BUFFERS GND PORTA DIGITAL INTERFACE PORTC DIGITAL INTERFACE AVCC MUX & ADC TWI ADC INTERFACE AREF TIMERS/ PROGRAM STACK COUNTERS OSCILLATOR COUNTER POINTER PROGRAM INTERNAL SRAM FLASH OSCILLATOR XTAL1 INSTRUCTION GENERAL WATCHDOG OSCILLATOR REGISTER PURPOSE TIMER REGISTERS XTAL2 X INSTRUCTION MCU CTRL. DECODER Y & TIMING RESET Z CONTROL INTERRUPT INTERNAL CALIBRATED LINES ALU UNIT OSCILLATOR AVR CPU STATUS EEPROM REGISTER PROGRAMMING SPI USART LOGIC + COMP. - INTERFACE PORTB DIGITAL INTERFACE PORTD DIGITAL INTERFACE PORTB DRIVERS/BUFFERS PORTD DRIVERS/BUFFERS PB0 - PB7 PD0 - PD7 3 2466TS–AVR–07/10

The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than con- ventional CISC microcontrollers. The ATmega16 provides the following features: 16 Kbytes of In-System Programmable Flash Program memory with Read-While-Write capabilities, 512 bytes EEPROM, 1 Kbyte SRAM, 32 general purpose I/O lines, 32 general purpose working registers, a JTAG interface for Boundary- scan, On-chip Debugging support and programming, three flexible Timer/Counters with com- pare modes, Internal and External Interrupts, a serial programmable USART, a byte oriented Two-wire Serial Interface, an 8-channel, 10-bit ADC with optional differential input stage with programmable gain (TQFP package only), a programmable Watchdog Timer with Internal Oscil- lator, an SPI serial port, and six software selectable power saving modes. The Idle mode stops the CPU while allowing the USART, Two-wire interface, A/D Converter, SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next External Inter- rupt or Hardware Reset. In Power-save mode, the Asynchronous Timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except Asynchronous Timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/reso- nator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low-power consumption. In Extended Standby mode, both the main Oscillator and the Asynchronous Timer continue to run. The device is manufactured using Atmel’s high density nonvolatile memory technology. The On- chip ISP Flash allows the program memory to be reprogrammed in-system through an SPI serial interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core. The boot program can use any interface to download the application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the Atmel ATmega16 is a powerful microcontroller that provides a highly-flexible and cost-effec- tive solution to many embedded control applications. The ATmega16 AVR is supported with a full suite of program and system development tools including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation kits. Pin Descriptions VCC Digital supply voltage. GND Ground. Port A (PA7..PA0) Port A serves as the analog inputs to the A/D Converter. Port A also serves as an 8-bit bi-directional I/O port, if the A/D Converter is not used. Port pins can provide internal pull-up resistors (selected for each bit). The Port A output buffers have sym- metrical drive characteristics with both high sink and source capability. When pins PA0 to PA7 are used as inputs and are externally pulled low, they will source current if the internal pull-up resistors are activated. The Port A pins are tri-stated when a reset condition becomes active, even if the clock is not running. ATmega16(L) 4 2466TS–AVR–07/10

ATmega16(L) Port B (PB7..PB0) Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port B also serves the functions of various special features of the ATmega16 as listed on page 58. Port C (PC7..PC0) Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset condition becomes active, even if the clock is not running. If the JTAG interface is enabled, the pull-up resistors on pins PC5(TDI), PC3(TMS) and PC2(TCK) will be activated even if a reset occurs. Port C also serves the functions of the JTAG interface and other special features of the ATmega16 as listed on page 61. Port D (PD7..PD0) Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port D also serves the functions of various special features of the ATmega16 as listed on page 63. RESET Reset Input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. The minimum pulse length is given in Table 15 on page 38. Shorter pulses are not guaranteed to generate a reset. XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. XTAL2 Output from the inverting Oscillator amplifier. AVCC AVCC is the supply voltage pin for Port A and the A/D Converter. It should be externally con- nected to V , even if the ADC is not used. If the ADC is used, it should be connected to V CC CC through a low-pass filter. AREF AREF is the analog reference pin for the A/D Converter. 5 2466TS–AVR–07/10

Resources A comprehensive set of development tools, application notes and datasheets are available for download on http://www.atmel.com/avr. Note: 1. Data Retention Reliability Qualification results show that the projected data retention failure rate is much less than 1 PPM over 20 years at 85°C or 100 years at 25°C. ATmega16(L) 6 2466TS–AVR–07/10

ATmega16(L) Register Summary Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page $3F ($5F) SREG I T H S V N Z C 9 $3E ($5E) SPH – – – – – SP10 SP9 SP8 12 $3D ($5D) SPL SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 12 $3C ($5C) OCR0 Timer/Counter0 Output Compare Register 85 $3B ($5B) GICR INT1 INT0 INT2 – – – IVSEL IVCE 48, 69 $3A ($5A) GIFR INTF1 INTF0 INTF2 – – – – – 70 $39 ($59) TIMSK OCIE2 TOIE2 TICIE1 OCIE1A OCIE1B TOIE1 OCIE0 TOIE0 85, 115, 133 $38 ($58) TIFR OCF2 TOV2 ICF1 OCF1A OCF1B TOV1 OCF0 TOV0 86, 115, 133 $37 ($57) SPMCR SPMIE RWWSB – RWWSRE BLBSET PGWRT PGERS SPMEN 250 $36 ($56) TWCR TWINT TWEA TWSTA TWSTO TWWC TWEN – TWIE 180 $35 ($55) MCUCR SM2 SE SM1 SM0 ISC11 ISC10 ISC01 ISC00 32, 68 $34 ($54) MCUCSR JTD ISC2 – JTRF WDRF BORF EXTRF PORF 41, 69, 231 $33 ($53) TCCR0 FOC0 WGM00 COM01 COM00 WGM01 CS02 CS01 CS00 83 $32 ($52) TCNT0 Timer/Counter0 (8 Bits) 85 OSCCAL Oscillator Calibration Register 30 $31(1) ($51)(1) OCDR On-Chip Debug Register 227 $30 ($50) SFIOR ADTS2 ADTS1 ADTS0 – ACME PUD PSR2 PSR10 57,88,134,201,221 $2F ($4F) TCCR1A COM1A1 COM1A0 COM1B1 COM1B0 FOC1A FOC1B WGM11 WGM10 110 $2E ($4E) TCCR1B ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10 113 $2D ($4D) TCNT1H Timer/Counter1 – Counter Register High Byte 114 $2C ($4C) TCNT1L Timer/Counter1 – Counter Register Low Byte 114 $2B ($4B) OCR1AH Timer/Counter1 – Output Compare Register A High Byte 114 $2A ($4A) OCR1AL Timer/Counter1 – Output Compare Register A Low Byte 114 $29 ($49) OCR1BH Timer/Counter1 – Output Compare Register B High Byte 114 $28 ($48) OCR1BL Timer/Counter1 – Output Compare Register B Low Byte 114 $27 ($47) ICR1H Timer/Counter1 – Input Capture Register High Byte 114 $26 ($46) ICR1L Timer/Counter1 – Input Capture Register Low Byte 114 $25 ($45) TCCR2 FOC2 WGM20 COM21 COM20 WGM21 CS22 CS21 CS20 128 $24 ($44) TCNT2 Timer/Counter2 (8 Bits) 130 $23 ($43) OCR2 Timer/Counter2 Output Compare Register 130 $22 ($42) ASSR – – – – AS2 TCN2UB OCR2UB TCR2UB 131 $21 ($41) WDTCR – – – WDTOE WDE WDP2 WDP1 WDP0 43 UBRRH URSEL – – – UBRR[11:8] 167 $20(2) ($40)(2) UCSRC URSEL UMSEL UPM1 UPM0 USBS UCSZ1 UCSZ0 UCPOL 166 $1F ($3F) EEARH – – – – – – – EEAR8 19 $1E ($3E) EEARL EEPROM Address Register Low Byte 19 $1D ($3D) EEDR EEPROM Data Register 19 $1C ($3C) EECR – – – – EERIE EEMWE EEWE EERE 19 $1B ($3B) PORTA PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 66 $1A ($3A) DDRA DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 66 $19 ($39) PINA PINA7 PINA6 PINA5 PINA4 PINA3 PINA2 PINA1 PINA0 66 $18 ($38) PORTB PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 66 $17 ($37) DDRB DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 66 $16 ($36) PINB PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 66 $15 ($35) PORTC PORTC7 PORTC6 PORTC5 PORTC4 PORTC3 PORTC2 PORTC1 PORTC0 67 $14 ($34) DDRC DDC7 DDC6 DDC5 DDC4 DDC3 DDC2 DDC1 DDC0 67 $13 ($33) PINC PINC7 PINC6 PINC5 PINC4 PINC3 PINC2 PINC1 PINC0 67 $12 ($32) PORTD PORTD7 PORTD6 PORTD5 PORTD4 PORTD3 PORTD2 PORTD1 PORTD0 67 $11 ($31) DDRD DDD7 DDD6 DDD5 DDD4 DDD3 DDD2 DDD1 DDD0 67 $10 ($30) PIND PIND7 PIND6 PIND5 PIND4 PIND3 PIND2 PIND1 PIND0 67 $0F ($2F) SPDR SPI Data Register 142 $0E ($2E) SPSR SPIF WCOL – – – – – SPI2X 142 $0D ($2D) SPCR SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 140 $0C ($2C) UDR USART I/O Data Register 163 $0B ($2B) UCSRA RXC TXC UDRE FE DOR PE U2X MPCM 164 $0A ($2A) UCSRB RXCIE TXCIE UDRIE RXEN TXEN UCSZ2 RXB8 TXB8 165 $09 ($29) UBRRL USART Baud Rate Register Low Byte 167 $08 ($28) ACSR ACD ACBG ACO ACI ACIE ACIC ACIS1 ACIS0 202 $07 ($27) ADMUX REFS1 REFS0 ADLAR MUX4 MUX3 MUX2 MUX1 MUX0 217 $06 ($26) ADCSRA ADEN ADSC ADATE ADIF ADIE ADPS2 ADPS1 ADPS0 219 $05 ($25) ADCH ADC Data Register High Byte 220 $04 ($24) ADCL ADC Data Register Low Byte 220 $03 ($23) TWDR Two-wire Serial Interface Data Register 182 $02 ($22) TWAR TWA6 TWA5 TWA4 TWA3 TWA2 TWA1 TWA0 TWGCE 182 7 2466TS–AVR–07/10

Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Page $01 ($21) TWSR TWS7 TWS6 TWS5 TWS4 TWS3 – TWPS1 TWPS0 181 $00 ($20) TWBR Two-wire Serial Interface Bit Rate Register 180 Notes: 1. When the OCDEN Fuse is unprogrammed, the OSCCAL Register is always accessed on this address. Refer to the debug- ger specific documentation for details on how to use the OCDR Register. 2. Refer to the USART description for details on how to access UBRRH and UCSRC. 3. For compatibility with future devices, reserved bits should be written to zero if accessed. Reserved I/O memory addresses should never be written. 4. Some of the Status Flags are cleared by writing a logical one to them. Note that the CBI and SBI instructions will operate on all bits in the I/O Register, writing a one back into any flag read as set, thus clearing the flag. The CBI and SBI instructions work with registers $00 to $1F only. ATmega16(L) 8 2466TS–AVR–07/10

ATmega16(L) Instruction Set Summary Mnemonics Operands Description Operation Flags #Clocks ARITHMETIC AND LOGIC INSTRUCTIONS ADD Rd, Rr Add two Registers Rd ← Rd + Rr Z,C,N,V,H 1 ADC Rd, Rr Add with Carry two Registers Rd ← Rd + Rr + C Z,C,N,V,H 1 ADIW Rdl,K Add Immediate to Word Rdh:Rdl ← Rdh:Rdl + K Z,C,N,V,S 2 SUB Rd, Rr Subtract two Registers Rd ← Rd - Rr Z,C,N,V,H 1 SUBI Rd, K Subtract Constant from Register Rd ← Rd - K Z,C,N,V,H 1 SBC Rd, Rr Subtract with Carry two Registers Rd ← Rd - Rr - C Z,C,N,V,H 1 SBCI Rd, K Subtract with Carry Constant from Reg. Rd ← Rd - K - C Z,C,N,V,H 1 SBIW Rdl,K Subtract Immediate from Word Rdh:Rdl ← Rdh:Rdl - K Z,C,N,V,S 2 AND Rd, Rr Logical AND Registers Rd ← Rd • Rr Z,N,V 1 ANDI Rd, K Logical AND Register and Constant Rd ← Rd • K Z,N,V 1 OR Rd, Rr Logical OR Registers Rd ← Rd v Rr Z,N,V 1 ORI Rd, K Logical OR Register and Constant Rd ← Rd v K Z,N,V 1 EOR Rd, Rr Exclusive OR Registers Rd ← Rd ⊕ Rr Z,N,V 1 COM Rd One’s Complement Rd ← $FF − Rd Z,C,N,V 1 NEG Rd Two’s Complement Rd ← $00 − Rd Z,C,N,V,H 1 SBR Rd,K Set Bit(s) in Register Rd ← Rd v K Z,N,V 1 CBR Rd,K Clear Bit(s) in Register Rd ← Rd • ($FF - K) Z,N,V 1 INC Rd Increment Rd ← Rd + 1 Z,N,V 1 DEC Rd Decrement Rd ← Rd − 1 Z,N,V 1 TST Rd Test for Zero or Minus Rd ← Rd • Rd Z,N,V 1 CLR Rd Clear Register Rd ← Rd ⊕ Rd Z,N,V 1 SER Rd Set Register Rd ← $FF None 1 MUL Rd, Rr Multiply Unsigned R1:R0 ← Rd x Rr Z,C 2 MULS Rd, Rr Multiply Signed R1:R0 ← Rd x Rr Z,C 2 MULSU Rd, Rr Multiply Signed with Unsigned R1:R0 ← Rd x Rr Z,C 2 FMUL Rd, Rr Fractional Multiply Unsigned R1:R0 ← (Rd x Rr) << 1 Z,C 2 FMULS Rd, Rr Fractional Multiply Signed R1:R0 ← (Rd x Rr) << 1 Z,C 2 FMULSU Rd, Rr Fractional Multiply Signed with Unsigned R1:R0 ← (Rd x Rr) << 1 Z,C 2 BRANCH INSTRUCTIONS RJMP k Relative Jump PC ← PC + k + 1 None 2 IJMP Indirect Jump to (Z) PC ← Z None 2 JMP k Direct Jump PC ← k None 3 RCALL k Relative Subroutine Call PC ← PC + k + 1 None 3 ICALL Indirect Call to (Z) PC ← Z None 3 CALL k Direct Subroutine Call PC ← k None 4 RET Subroutine Return PC ← STACK None 4 RETI Interrupt Return PC ← STACK I 4 CPSE Rd,Rr Compare, Skip if Equal if (Rd = Rr) PC ← PC + 2 or 3 None 1 / 2 / 3 CP Rd,Rr Compare Rd − Rr Z, N,V,C,H 1 CPC Rd,Rr Compare with Carry Rd − Rr − C Z, N,V,C,H 1 CPI Rd,K Compare Register with Immediate Rd − K Z, N,V,C,H 1 SBRC Rr, b Skip if Bit in Register Cleared if (Rr(b)=0) PC ← PC + 2 or 3 None 1 / 2 / 3 SBRS Rr, b Skip if Bit in Register is Set if (Rr(b)=1) PC ← PC + 2 or 3 None 1 / 2 / 3 SBIC P, b Skip if Bit in I/O Register Cleared if (P(b)=0) PC ← PC + 2 or 3 None 1 / 2 / 3 SBIS P, b Skip if Bit in I/O Register is Set if (P(b)=1) PC ← PC + 2 or 3 None 1 / 2 / 3 BRBS s, k Branch if Status Flag Set if (SREG(s) = 1) then PC←PC+k + 1 None 1 / 2 BRBC s, k Branch if Status Flag Cleared if (SREG(s) = 0) then PC←PC+k + 1 None 1 / 2 BREQ k Branch if Equal if (Z = 1) then PC ← PC + k + 1 None 1 / 2 BRNE k Branch if Not Equal if (Z = 0) then PC ← PC + k + 1 None 1 / 2 BRCS k Branch if Carry Set if (C = 1) then PC ← PC + k + 1 None 1 / 2 BRCC k Branch if Carry Cleared if (C = 0) then PC ← PC + k + 1 None 1 / 2 BRSH k Branch if Same or Higher if (C = 0) then PC ← PC + k + 1 None 1 / 2 BRLO k Branch if Lower if (C = 1) then PC ← PC + k + 1 None 1 / 2 BRMI k Branch if Minus if (N = 1) then PC ← PC + k + 1 None 1 / 2 BRPL k Branch if Plus if (N = 0) then PC ← PC + k + 1 None 1 / 2 BRGE k Branch if Greater or Equal, Signed if (N ⊕ V= 0) then PC ← PC + k + 1 None 1 / 2 BRLT k Branch if Less Than Zero, Signed if (N ⊕ V= 1) then PC ← PC + k + 1 None 1 / 2 BRHS k Branch if Half Carry Flag Set if (H = 1) then PC ← PC + k + 1 None 1 / 2 BRHC k Branch if Half Carry Flag Cleared if (H = 0) then PC ← PC + k + 1 None 1 / 2 BRTS k Branch if T Flag Set if (T = 1) then PC ← PC + k + 1 None 1 / 2 BRTC k Branch if T Flag Cleared if (T = 0) then PC ← PC + k + 1 None 1 / 2 BRVS k Branch if Overflow Flag is Set if (V = 1) then PC ← PC + k + 1 None 1 / 2 BRVC k Branch if Overflow Flag is Cleared if (V = 0) then PC ← PC + k + 1 None 1 / 2 9 2466TS–AVR–07/10

Mnemonics Operands Description Operation Flags #Clocks BRIE k Branch if Interrupt Enabled if ( I = 1) then PC ← PC + k + 1 None 1 / 2 BRID k Branch if Interrupt Disabled if ( I = 0) then PC ← PC + k + 1 None 1 / 2 DATA TRANSFER INSTRUCTIONS MOV Rd, Rr Move Between Registers Rd ← Rr None 1 MOVW Rd, Rr Copy Register Word Rd+1:Rd ← Rr+1:Rr None 1 LDI Rd, K Load Immediate Rd ← K None 1 LD Rd, X Load Indirect Rd ← (X) None 2 LD Rd, X+ Load Indirect and Post-Inc. Rd ← (X), X ← X + 1 None 2 LD Rd, - X Load Indirect and Pre-Dec. X ← X - 1, Rd ← (X) None 2 LD Rd, Y Load Indirect Rd ← (Y) None 2 LD Rd, Y+ Load Indirect and Post-Inc. Rd ← (Y), Y ← Y + 1 None 2 LD Rd, - Y Load Indirect and Pre-Dec. Y ← Y - 1, Rd ← (Y) None 2 LDD Rd,Y+q Load Indirect with Displacement Rd ← (Y + q) None 2 LD Rd, Z Load Indirect Rd ← (Z) None 2 LD Rd, Z+ Load Indirect and Post-Inc. Rd ← (Z), Z ← Z+1 None 2 LD Rd, -Z Load Indirect and Pre-Dec. Z ← Z - 1, Rd ← (Z) None 2 LDD Rd, Z+q Load Indirect with Displacement Rd ← (Z + q) None 2 LDS Rd, k Load Direct from SRAM Rd ← (k) None 2 ST X, Rr Store Indirect (X) ← Rr None 2 ST X+, Rr Store Indirect and Post-Inc. (X) ← Rr, X ← X + 1 None 2 ST - X, Rr Store Indirect and Pre-Dec. X ← X - 1, (X) ← Rr None 2 ST Y, Rr Store Indirect (Y) ← Rr None 2 ST Y+, Rr Store Indirect and Post-Inc. (Y) ← Rr, Y ← Y + 1 None 2 ST - Y, Rr Store Indirect and Pre-Dec. Y ← Y - 1, (Y) ← Rr None 2 STD Y+q,Rr Store Indirect with Displacement (Y + q) ← Rr None 2 ST Z, Rr Store Indirect (Z) ← Rr None 2 ST Z+, Rr Store Indirect and Post-Inc. (Z) ← Rr, Z ← Z + 1 None 2 ST -Z, Rr Store Indirect and Pre-Dec. Z ← Z - 1, (Z) ← Rr None 2 STD Z+q,Rr Store Indirect with Displacement (Z + q) ← Rr None 2 STS k, Rr Store Direct to SRAM (k) ← Rr None 2 LPM Load Program Memory R0 ← (Z) None 3 LPM Rd, Z Load Program Memory Rd ← (Z) None 3 LPM Rd, Z+ Load Program Memory and Post-Inc Rd ← (Z), Z ← Z+1 None 3 SPM Store Program Memory (Z) ← R1:R0 None - IN Rd, P In Port Rd ← P None 1 OUT P, Rr Out Port P ← Rr None 1 PUSH Rr Push Register on Stack STACK ← Rr None 2 POP Rd Pop Register from Stack Rd ← STACK None 2 BIT AND BIT-TEST INSTRUCTIONS SBI P,b Set Bit in I/O Register I/O(P,b) ← 1 None 2 CBI P,b Clear Bit in I/O Register I/O(P,b) ← 0 None 2 LSL Rd Logical Shift Left Rd(n+1) ← Rd(n), Rd(0) ← 0 Z,C,N,V 1 LSR Rd Logical Shift Right Rd(n) ← Rd(n+1), Rd(7) ← 0 Z,C,N,V 1 ROL Rd Rotate Left Through Carry Rd(0)←C,Rd(n+1)← Rd(n),C←Rd(7) Z,C,N,V 1 ROR Rd Rotate Right Through Carry Rd(7)←C,Rd(n)← Rd(n+1),C←Rd(0) Z,C,N,V 1 ASR Rd Arithmetic Shift Right Rd(n) ← Rd(n+1), n=0..6 Z,C,N,V 1 SWAP Rd Swap Nibbles Rd(3..0)←Rd(7..4),Rd(7..4)←Rd(3..0) None 1 BSET s Flag Set SREG(s) ← 1 SREG(s) 1 BCLR s Flag Clear SREG(s) ← 0 SREG(s) 1 BST Rr, b Bit Store from Register to T T ← Rr(b) T 1 BLD Rd, b Bit load from T to Register Rd(b) ← T None 1 SEC Set Carry C ← 1 C 1 CLC Clear Carry C ← 0 C 1 SEN Set Negative Flag N ← 1 N 1 CLN Clear Negative Flag N ← 0 N 1 SEZ Set Zero Flag Z ← 1 Z 1 CLZ Clear Zero Flag Z ← 0 Z 1 SEI Global Interrupt Enable I ← 1 I 1 CLI Global Interrupt Disable I ← 0 I 1 SES Set Signed Test Flag S ← 1 S 1 CLS Clear Signed Test Flag S ← 0 S 1 SEV Set Twos Complement Overflow. V ← 1 V 1 CLV Clear Twos Complement Overflow V ← 0 V 1 SET Set T in SREG T ← 1 T 1 CLT Clear T in SREG T ← 0 T 1 SEH Set Half Carry Flag in SREG H ← 1 H 1 ATmega16(L) 10 2466TS–AVR–07/10

ATmega16(L) Mnemonics Operands Description Operation Flags #Clocks CLH Clear Half Carry Flag in SREG H ← 0 H 1 MCU CONTROL INSTRUCTIONS NOP No Operation None 1 SLEEP Sleep (see specific descr. for Sleep function) None 1 WDR Watchdog Reset (see specific descr. for WDR/timer) None 1 BREAK Break For On-Chip Debug Only None N/A 11 2466TS–AVR–07/10

Ordering Information Speed (MHz) Power Supply Ordering Code Package Operation Range ATmega16L-8AU(1) 44A Industrial 8 2.7V - 5.5V ATmega16L-8PU(1) 40P6 (-40oC to 85oC) ATmega16L-8MU(1) 44M1 ATmega16-16AU(1) 44A Industrial 16 4.5V - 5.5V ATmega16-16PU(1) 40P6 (-40oC to 85oC) ATmega16-16MU(1) 44M1 Note: 1. Pb-free packaging complies to the European Directive for Restriction of Hazardous Substances (RoHS directive). Also Halide free and fully Green. Package Type 44A 44-lead, Thin (1.0 mm) Plastic Gull Wing Quad Flat Package (TQFP) 40P6 40-pin, 0.600” Wide, Plastic Dual Inline Package (PDIP) 44M1 44-pad, 7 × 7 × 1.0 mm body, lead pitch 0.50 mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF) ATmega16(L) 12 2466TS–AVR–07/10

ATmega16(L) Packaging Information 44A PIN 1 B PIN 1 IDENTIFIER e E1 E D1 D C 0˚~7˚ A1 A2 A L COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL MIN NOM MAX NOTE A – – 1.20 A1 0.05 – 0.15 A2 0.95 1.00 1.05 D 11.75 12.00 12.25 D1 9.90 10.00 10.10 Note 2 E 11.75 12.00 12.25 Notes: 1.This package conforms to JEDEC reference MS-026, Variation ACB. 2.Dimensions D1 and E1 do not include mold protrusion. Allowable E1 9.90 10.00 10.10 Note 2 protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum B 0.30 – 0.45 plastic body size dimensions including mold mismatch. C 0.09 – 0.20 3. Lead coplanarity is 0.10 mm maximum. L 0.45 – 0.75 e 0.80 TYP 10/5/2001 TITLE DRAWING NO. REV. 2325 Orchard Parkway 44A, 44-lead, 10 x 10 mm Body Size, 1.0 mm Body Thickness, San Jose, CA 95131 44A B R 0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) 13 2466TS–AVR–07/10

40P6 D PIN 1 E1 A SEATING PLANE A1 L B B1 e E COMMON DIMENSIONS 0º ~ 15º REF (Unit of Measure = mm) C SYMBOL MIN NOM MAX NOTE eB A – – 4.826 A1 0.381 – – D 52.070 – 52.578 Note 2 E 15.240 – 15.875 E1 13.462 – 13.970 Note 2 B 0.356 – 0.559 B1 1.041 – 1.651 Notes: 1.This package conforms to JEDEC reference MS-011, Variation AC. 2.Dimensions D and E1 do not include mold Flash or Protrusion. L 3.048 – 3.556 Mold Flash or Protrusion shall not exceed 0.25 mm (0.010"). C 0.203 – 0.381 eB 15.494 – 17.526 e 2.540 TYP 09/28/01 TITLE DRAWING NO. REV. 2325 Orchard Parkway 40P6, 40-lead (0.600"/15.24 mm Wide) Plastic Dual R San Jose, CA 95131 Inline Package (PDIP) 40P6 B ATmega16(L) 14 2466TS–AVR–07/10

ATmega16(L) 44M1 D Marked Pin# 1 ID E SEATING PLANE A1 TOP VIEW A3 A K L D2 Pin #1 Corner SIDE VIEW 1 Option A Pin #1 COMMON DIMENSIONS Triangle 2 (Unit of Measure = mm) 3 SYMBOL MIN NOM MAX NOTE A 0.80 0.90 1.00 E2 Option B A1 – 0.02 0.05 Pin #1 Chamfer (C 0.30) A3 0.20 REF b 0.18 0.23 0.30 D 6.9 0 7.00 7.10 K Option C Pin #1 D2 5.00 5.20 5.40 b e N(0o.2tc0h R) E 6.90 7.00 7.10 BOTTOM VIEW E2 5.00 5.20 5.40 e 0.50 BSC L 0.59 0.64 0.69 Note: JEDEC Standard MO-220, Fig. 1 (SAW Singulation) VKKD-3. K 0.20 0.26 0.41 9/26/08 TITLE GPC DRAWING NO. REV. Package Drawing Contact: 44M1, 44-pad, 7 x 7 x 1.0 mm Body, Lead packagedrawings@atmel.com Pitch 0.50 mm, 5.20 mm Exposed Pad, Thermally ZWS 44M1 H Enhanced Plastic Very Thin Quad Flat No Lead Package (VQFN) 15 2466TS–AVR–07/10

Errata The revision letter in this section refers to the revision of the ATmega16 device. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed M (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed L (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. ATmega16(L) 16 2466TS–AVR–07/10

ATmega16(L) Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed K (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. 17 2466TS–AVR–07/10

Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed J (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. ATmega16(L) 18 2466TS–AVR–07/10

ATmega16(L) Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed I (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 19 2466TS–AVR–07/10

4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) Rev. (cid:129) First Analog Comparator conversion may be delayed H (cid:129) Interrupts may be lost when writing the timer registers in the asynchronous timer (cid:129) IDCODE masks data from TDI input (cid:129) Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first Analog Comparator conversion will CC take longer than expected on some devices. Problem Fix/Workaround When the device has been powered or reset, disable then enable theAnalog Comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronized to the asynchronous timer clock is written when the asynchronous Timer/Counter register(TCNTx) is 0x00. Problem Fix / Workaround Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register(TCCRx), asynchronous Timer Counter Register(TCNTx), or asynchronous Output Compare Register(OCRx). 3. IDCODE masks data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR. Problem Fix / Workaround – If ATmega16 is the only device in the scan chain, the problem is not visible. – Select the Device ID Register of the ATmega16 by issuing the IDCODE instruction or by entering the Test-Logic-Reset state of the TAP controller to read out the contents of its Device ID Register and possibly data from succeeding devices of the scan chain. Issue the BYPASS instruction to the ATmega16 while reading the Device ID Registers of preceding devices of the boundary scan chain. – If the Device IDs of all devices in the boundary scan chain must be captured simultaneously, the ATmega16 must be the fist device in the chain. 4. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR reg- ister triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround Always use OUT or SBI to set EERE in EECR. ATmega16(L) 20 2466TS–AVR–07/10

ATmega16(L) Datasheet Please note that the referring page numbers in this section are referred to this document. The Revision referring revision in this section are referring to the document revision. History Rev. 2466T-07/10 1. Corrected use of comma in formula Rp in Table120, “Two-wire Serial Bus Require- ments,” on page294. 2. Updated document according to Atmel’s Technical Terminology 3. Note 6 and Note 7 under Table120, “Two-wire Serial Bus Requirements,” on page294 have been removed. Rev. 2466S-05/09 1. Updated “Errata” on page 340. 2. Updated the last page with Atmel’s new adresses. Rev. 2466R-06/08 1. Added “Not recommended for new designs” note in Figure on page 1. Rev. 2466Q-05/08 1. Updated “Fast PWM Mode” on page 77 in “8-bit Timer/Counter0 with PWM” on page 71: – Removed the last section describing how to achieve a frequency with 50% duty cycle waveform output in fast PWM mode. 2. Removed note from Feature list in “Analog to Digital Converter” on page 204. 3. Removed note from Table 84 on page 218. 4. Updated “Ordering Information” on page 336: - Commercial ordering codes removed. - Non Pb-free package option removed. Rev. 2466P-08/07 1. Updated “Features” on page 1. 2. Added “Data Retention” on page 6. 3. Updated “Errata” on page 340. 4. Updated “Slave Mode” on page 140. Rev. 2466O-03/07 1. Updated “Calibrated Internal RC Oscillator” on page 29. 2. Updated C code example in “USART Initialization” on page 149. 3. Updated “ATmega16 Boundary-scan Order” on page 241. 4. Removed “premilinary” from “ADC Characteristics” on page 297. 5. Updated from V to mV in “I/O Pin Input Hysteresis vs. V ” on page 317. CC 6. Updated from V to mV in “Reset Input Pin Hysteresis vs. V ” on page 318. CC 21 2466TS–AVR–07/10

Rev. 2466N-10/06 1. Updated “Timer/Counter Oscillator” on page 31. 2. Updated “Fast PWM Mode” on page 102. 3. Updated Table 38 on page 83, Table 40 on page 84, Table 45 on page 111, Table 47 on page 112, Table 50 on page 128 and Table 52 on page 129. 4. Updated C code example in “USART Initialization” on page 149. 5. Updated “Errata” on page 340. Rev. 2466M-04/06 1. Updated typos. 2. Updated “Serial Peripheral Interface – SPI” on page 135. 3. Updated Table 86 on page 221, Table 116 on page 276 ,Table 121 on page 295 and Table 122 on page 297. Rev. 2466L-06/05 1. Updated note in “Bit Rate Generator Unit” on page 178. 2. Updated values for V in “ADC Characteristics” on page 297. INT 3. Updated “Serial Programming Instruction set” on page 276. 4. Updated USART init C-code example in “USART” on page 144. Rev. 2466K-04/05 1. Updated “Ordering Information” on page 336. 2. MLF-package alternative changed to “Quad Flat No-Lead/Micro Lead Frame Package QFN/MLF”. 3. Updated “Electrical Characteristics” on page 291. Rev. 2466J-10/04 1. Updated “Ordering Information” on page 336. Rev. 2466I-10/04 1. Removed references to analog ground. 2. Updated Table 7 on page 28, Table 15 on page 38, Table 16 on page 42, Table 81 on page 209, Table 116 on page 276, and Table 119 on page 293. 3. Updated “Pinout ATmega16” on page 2. 4. Updated features in “Analog to Digital Converter” on page 204. 5. Updated “Version” on page 229. 6. Updated “Calibration Byte” on page 261. 7. Added “Page Size” on page 262. Rev. 2466H-12/03 1. Updated “Calibrated Internal RC Oscillator” on page 29. ATmega16(L) 22 2466TS–AVR–07/10

ATmega16(L) Rev. 2466G-10/03 1. Removed “Preliminary” from the datasheet. 2. Changed ICP to ICP1 in the datasheet. 3. Updated “JTAG Interface and On-chip Debug System” on page 36. 4. Updated assembly and C code examples in “Watchdog Timer Control Register – WDTCR” on page 43. 5. Updated Figure 46 on page 103. 6. Updated Table 15 on page 38, Table 82 on page 217 and Table 115 on page 276. 7. Updated “Test Access Port – TAP” on page 222 regarding JTAGEN. 8. Updated description for the JTD bit on page 231. 9. Added note 2 to Figure 126 on page 252. 10. Added a note regarding JTAGEN fuse to Table 105 on page 260. 11. Updated Absolute Maximum Ratings* and DC Characteristics in “Electrical Character- istics” on page 291. 12. Updated “ATmega16 Typical Characteristics” on page 299. 13. Fixed typo for 16 MHz QFN/MLF package in “Ordering Information” on page 336. 14. Added a proposal for solving problems regarding the JTAG instruction IDCODE in “Errata” on page 340. Rev. 2466F-02/03 1. Added note about masking out unused bits when reading the Program Counter in “Stack Pointer” on page 12. 2. Added Chip Erase as a first step in “Programming the Flash” on page 288 and “Pro- gramming the EEPROM” on page 289. 3. Added the section “Unconnected pins” on page 55. 4. Added tips on how to disable the OCD system in “On-chip Debug System” on page 34. 5. Removed reference to the “Multi-purpose Oscillator” application note and “32kHz Crystal Oscillator” application note, which do not exist. 6. Added information about PWM symmetry for Timer0 and Timer2. 7. Added note in “Filling the Temporary Buffer (Page Loading)” on page 253 about writ- ing to the EEPROM during an SPM Page Load. 8. Removed ADHSM completely. 23 2466TS–AVR–07/10

9. Added Table73, “TWI Bit Rate Prescaler,” on page182 to describe the TWPS bits in the “TWI Status Register – TWSR” on page 181. 10. Added section “Default Clock Source” on page 25. 11. Added note about frequency variation when using an external clock. Note added in “External Clock” on page 31. An extra row and a note added in Table 118 on page 293. 12. Various minor TWI corrections. 13. Added “Power Consumption” data in “Features” on page 1. 14. Added section “EEPROM Write During Power-down Sleep Mode” on page 22. 15. Added note about Differential Mode with Auto Triggering in “Prescaling and Conver- sion Timing” on page 207. 16. Added updated “Packaging Information” on page 337. Rev. 2466E-10/02 1. Updated “DC Characteristics” on page 291. Rev. 2466D-09/02 1. Changed all Flash write/erase cycles from 1,000 to 10,000. 2. Updated the following tables: Table 4 on page 26, Table 15 on page 38, Table 42 on page 85, Table 45 on page 111, Table 46 on page 111, Table 59 on page 143, Table 67 on page 167, Table 90 on page 235, Table 102 on page 258, “DC Characteristics” on page 291, Table 119 on page 293, Table 121 on page 295, and Table 122 on page 297. 3. Updated “Errata” on page 340. Rev. 2466C-03/02 1. Updated typical EEPROM programming time, Table 1 on page 20. 2. Updated typical start-up time in the following tables: Table 3 on page 25, Table 5 on page 27, Table 6 on page 28, Table 8 on page 29, Table 9 on page 29, and Table 10 on page 29. 3. Updated Table 17 on page 43 with typical WDT Time-out. 4. Added Some Preliminary Test Limits and Characterization Data. Removed some of the TBD's in the following tables and pages: Table 15 on page 38, Table 16 on page 42, Table 116 on page 272 (table removed in docu- ment review #D), “Electrical Characteristics” on page 291, Table 119 on page 293, Table 121 on page 295, and Table 122 on page 297. 5. Updated TWI Chapter. Added the note at the end of the “Bit Rate Generator Unit” on page 178. 6. Corrected description of ADSC bit in “ADC Control and Status Register A – ADCSRA” on page 219. 7. Improved description on how to do a polarity check of the ADC doff results in “ADC Conversion Result” on page 216. ATmega16(L) 24 2466TS–AVR–07/10

ATmega16(L) 8. Added JTAG version number for rev. H in Table 87 on page 229. 9. Added not regarding OCDEN Fuse below Table 105 on page 260. 10. Updated Programming Figures: Figure 127 on page 262 and Figure 136 on page 273 are updated to also reflect that AVCC must be connected during Programming mode. Figure 131 on page 269 added to illustrate how to program the fuses. 11. Added a note regarding usage of the “PROG_PAGELOAD ($6)” on page 280 and “PROG_PAGEREAD ($7)” on page 280. 12. Removed alternative algortihm for leaving JTAG Programming mode. See “Leaving Programming Mode” on page 288. 13. Added Calibrated RC Oscillator characterization curves in section “ATmega16 Typi- cal Characteristics” on page 299. 14. Corrected ordering code for QFN/MLF package (16MHz) in “Ordering Information” on page 336. 15. Corrected Table90, “Scan Signals for the Oscillators(1)(2)(3),” on page235. 25 2466TS–AVR–07/10

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