name: AT89C2051 function: Microcontroller package: DIP,20 manufacturer: Atmel added-by: Robert A. Rioja +--()--+ Reset | 1 20| VCC P3.0 (RXD) | 2 19| P1.7 P3.1 (TXD) | 3 18| P1.6 XTAL2 | 4 17| P1.5 XTAL1 | 5 16| P1.4 P3.2 (INT0) | 6 15| P1.3 P3.3 (INT1) | 7 14| P1.2 P3.4 (T0) | 8 13| P1.1 (AIN1) P3.5 (T1) | 9 12| P1.0 (AIN0) GND |10 11| P3.7 +------+ This information was added by a third party and may be incorrect. This pinout came from the Chipdir: http://www.chipdir.org/