| 16C57 | 16F876 | 16F876 | 16C57 | ||||
| MCLR/VPP | 28 | 1 | 6 | 1 | TOCK1 | ||
| OSC1/CLKIN | 27 | 9 | 20 | 2 | VDD | ||
| OSC2/CLKOUT | 26 | 10 | 3 | NC | |||
| RC7 | 25 | 18 | 8 | 19 | 4 | VSS | |
| RC6 | 24 | 17 | 5 | NC | |||
| RC5 | 23 | 16 | 2 | 6 | RA0 | ||
| RC4 | 22 | 15 | 3 | 7 | RA1 | ||
| RC3 | 21 | 14 | 4 | 8 | RA2 | ||
| RC2 | 20 | 13 | 5 | 9 | RA3 | ||
| RC1 | 19 | 12 | 21 | 10 | RB0 | ||
| RC0 | 18 | 11 | 22 | 11 | RB1 | ||
| RB7 | 17 | 28 | 23 | 12 | RB2 | ||
| RB6 | 16 | 27 | 24 | 13 | RB3 | ||
| RB5 | 15 | 26 | 25 | 14 | RB4 |