8254 Programmable interval Timer
By K.Praveen kumar reddy
Features of 8254 programmable timer
Block diagram of 8254
Operating modes of counters
Control word format
Mode 0: Interruppt on terminal count
Description of mode 0
Mode 1: hardware retriggerable one shot mode
Mode 2: Rate generator
Mode 3: square wave mode
Mode 4: software triggered strobe
Mode 5: hardware triggered strobe