PIC1655, PIC1657 (DIP) MicroChip PIC microcontrollers. +----------+ RTCC |1 +--+ 28| /RST VCC |2 27| X1 |3 26| X0 GND |4 25| RC7 |5 24| RC6 RA0 |6 PIC 23| RC5 RA1 |7 16C55 22| RC4 RA2 |8 16C57 21| RC3 RA3 |9 20| RC2 RB0 |10 19| RC1 RB1 |11 18| RC0 RB2 |12 17| RB7 RB3 |13 16| RB6 RB4 |14 15| RB5 +----------+ [This information is part of the GIICM] PIC1655, PIC1657 (SO) MicroChip PIC microcontrollers. +----------+ GND |1 +--+ 28| /RST RTCC |2 27| X1 VCC |3 26| X0 VCC |4 25| RC7 RA0 |5 24| RC6 RA1 |6 PIC 23| RC5 RA2 |7 16C55 22| RC4 RA3 |8 16C57 21| RC3 RB0 |9 20| RC2 RB1 |10 19| RC1 RB2 |11 18| RC0 RB3 |12 17| RB7 RB4 |13 16| RB6 GND |14 15| RB5 +----------+ [This information is part of the GIICM]