| (XCK0/T0) PB0 | 1 • | 40 | PA0 (ADC0) |
| (T1) PB1 | 2 | 39 | PA1 (ADC1) |
| (INT2/AIN0) PB2 | 3 | 38 | PA2 (ADC2) |
| (OC0/AIN1) PB3 | 4 | 37 | PA3 (ADC3) |
| (SS) PB4 | 5 | 36 | PA4 (ADC4) |
| (MOSI) PB5 | 6 | 35 | PA5 (ADC5) |
| (MISO) PB6 | 7 | 34 | PA6 (ADC6) |
| (SCK) PB7 | 8 | 33 | PA7 (ADC7) |
| RESET | 9 | 32 | AREF |
| Vcc | 10 | 31 | GND |
| GND | 11 | 30 | AVcc |
| XTAL2 | 12 | 29 | PC7 (TOSC2) |
| XTAL1 | 13 | 28 | PC6 (TOSC1) |
| (RXD) PD0 | 14 | 27 | PC5 (TDI) |
| (TXD) PD1 | 15 | 26 | PC4 (TDO) |
| (INT0) PD2 | 16 | 25 | PC3 (TMS) |
| (INT1) PD3 | 17 | 24 | PC2 (TCK) |
| (OC1B) PD4 | 18 | 23 | PC1 (SDA) |
| (OC1A) PD5 | 19 | 22 | PC0 (SCL) |
| (ICP1) PD6 | 20 | 21 | PD7 (OC2) |
| Pin | Symbol | Description |
|---|---|---|
| 1 | (XCK0/T0) PB0 | port B |
| 2 | (T1) PB1 | port B |
| 3 | (INT2/AIN0) PB2 | external interrupt 2; port B |
| 4 | (OC0/AIN1) PB3 | port B |
| 5 | (SS) PB4 | SPI slave select; port B |
| 6 | (MOSI) PB5 | SPI master output/slave input; port B |
| 7 | (MISO) PB6 | SPI master input/slave output; port B |
| 8 | (SCK) PB7 | SPI master clock; port B |
| 9 | RESET | reset (active low) |
| 10 | Vcc | supply voltage |
| 11 | GND | ground |
| 12 | XTAL2 | clock oscillator pin 2 |
| 13 | XTAL1 | clock oscillator pin 1 |
| 14 | (RXD) PD0 | UART receive; port D |
| 15 | (TXD) PD1 | UART transmit; port D |
| 16 | (INT0) PD2 | external interrupt 0; port D |
| 17 | (INT1) PD3 | external interrupt 1; port D |
| 18 | (OC1B) PD4 | port D |
| 19 | (OC1A) PD5 | port D |
| 20 | (ICP1) PD6 | port D |
| 21 | PD7 (OC2) | port D |
| 22 | PC0 (SCL) | 2-wire clock line; port C |
| 23 | PC1 (SDA) | 2-wire data line; port C |
| 24 | PC2 (TCK) | JTAG test clock; port C |
| 25 | PC3 (TMS) | JTAG test mode select; port C |
| 26 | PC4 (TDO) | JTAG test data output; port C |
| 27 | PC5 (TDI) | JTAG test data input; port C |
| 28 | PC6 (TOSC1) | timer oscillator pin 1; port C |
| 29 | PC7 (TOSC2) | timer oscillator pin 2; port C |
| 30 | AVcc | A/D converter supply voltage |
| 31 | GND | ground |
| 32 | AREF | analog reference for A/D converter |
| 33 | PA7 (ADC7) | port A |
| 34 | PA6 (ADC6) | port A |
| 35 | PA5 (ADC5) | port A |
| 36 | PA4 (ADC4) | port A |
| 37 | PA3 (ADC3) | port A |
| 38 | PA2 (ADC2) | port A |
| 39 | PA1 (ADC1) | port A |
| 40 | PA0 (ADC0) | port A |
| Parameter | Value | Unit |
|---|---|---|
| Flash memory | 16K (ATmega16) 32K (ATmega32) | bytes |
| Internal SRAM | 1K (ATmega16) 2K (ATmega32) | bytes |
| EEPROM | 512 (ATmega16) 1K (ATmega32) | bytes |
| Programmable I/O lines | 32 |
Note: Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.