hc82c54数据手册 S E M I C O N D U C T O R 82C54 August 1996 CMOS Programmable Interval Timer Features Description 8MHz to 12MHz Clock Input Frequency The Harris 82C54 is a high performance CMOS Programma- Compatible with NMOS 8254 ble Interval Timer manufactured using an advanced 2 micron CMOS process. - Enhanced Version of NMOS 8253 Three Independent……