name: HT48C50_SKDIP2818PIN function: 8-Bit Microcontroller package: SKDIP28,28 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 PB0 |10 19| RESB VSS |11 18| PC5(TMR1) INTB(TMR0) |12 17| PC4 PC0 |13 16| PC3 PC1 |14 15| PC2 +------+ This pinout came from the Chipdir: http://www.chipdir.org/ name: HT48C50_DIP40 function: 8-Bit Microcontroller package: DIP40,40 manufacturer: Holtek +--()--+ PB5 | 1 40| PB6 PB4 | 2 39| PB7 PA3 | 3 38| PA4 PA2 | 4 37| PA5 PA1 | 5 36| PA6 PA0 | 6 35| PA7 PB3 | 7 34| OSC2 PB2 | 8 33| OSC1 PB1 | 9 32| VDD PB0 |10 31| RESB PD7 |11 30| TMR1 PD6 |12 29| PD3 PD5 |13 28| PD2 PD4 |14 27| PD1 VSS |15 26| PD0 INTB |16 25| PC7 TMR0 |17 24| PC6 PC0 |18 23| PC5 PC1 |19 22| PC4 PC2 |20 21| PC3 +------+ This pinout came from the Chipdir: http://www.chipdir.org/