name: HT48R05A-1 function: 8-Bit OTP Microcontroller package: DIP/SOP18,18 manufacturer: Holtek +--()--+ PA3 | 1 18| PA4 PA2 | 2 17| PA5 PA1 | 3 16| PA6 PA0 | 4 15| PA7 PB2 | 5 14| OSC2 PB1/BZB | 6 13| OSC1 PB0/BZ | 7 12| VDD VSS | 8 11| RESB PC0/INTB | 9 10| PC1/TMR +------+ This pinout came from the Chipdir: http://www.chipdir.org/