name: HT99C421C function: Cordless Phone Controller package: CERDIP window28,28 manufacturer: Holtek +--()--+ PB5 | 1 28| PB6 PB4 | 2 27| PB7 PA3 | 3 26| PA4 PA2 | 4 25| PA5 PA1 | 5 24| PA6 PA0 | 6 23| PA7 PB3 | 7 22| OSC2 PB2 | 8 21| OSC1 PB1 | 9 20| VDD/AVDD PB0 |10 19| RESB PD7 |11 18| PD2 PD6 |12 17| PD1 PD5 |13 16| PD0 VSS/AVSS |14 15| AOUT +------+ This pinout came from the Chipdir: http://www.chipdir.org/