name: ATmega161 function: MCU package: TQFP-44,44 manufacturer: Atmel added-by: comment: 8-Bit AVR, 16k FLASH, 512 EEPROM, 1k SRAM, 2xUART, SPI, RTC, ext. Mem +----------------------+--------------+--------------------+---------------------+ | 1 - PB5, MOSI | 12 - PD6, /WR| 23 - A13, PC5 | 34 - AD3, PA3 | | 2 - PB6, MISO | 13 - PD7, /RD| 24 - A14, PC6 | 35 - AD2, PA2 | | 3 - PB7, SCK | 14 - XTAL2 | 25 - A15, PC7 | 36 - AD1, PA1 | | 4 - /RESET | 15 - XTAL1 | 26 - OC1B, PE2 | 37 - AD0, PA0 | | 5 - PD0, RXD0 | 16 - GND | 27 - ALE, PE1 | 38 - VCC | | 6 - NC | 17 - NC | 28 - NC | 39 - NC | | 7 - PD1, TXD0 | 18 - PC0, A8 | 29 - ICP, INT2, PE0| 40 - OC0, T0, PB0 | | 8 - PD2, INT0 | 19 - PC1, A9 | 30 - AD7, PA7 | 41 - OC2, T1, PB1 | | 9 - PD3, INT1 | 20 - PC2, A10| 31 - AD6, PA6 | 42 - AIN0, RXD1, PB2| | 10 - PD4, TOSC1 | 21 - PC3, A11| 32 - AD5, PA5 | 43 - AIN1, TXD1, PB3| | 11 - PD5, TOSC2, OC1A| 22 - PC4, A12| 33 - AD4, PA4 | 44 - /SS, PB4 | +----------------------+--------------+--------------------+---------------------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/