Dr A Sahu Dept of Comp Sc & Engg. IIT Guwahati. 8155 I/O + Timer 8155 I/O + Timer 8255 I/O 8255 I/O 8253/54 Timer 8253/54 Timer 2 Port (A,B), No Bidirectional.
8254 SOFTWARE PROGRAMMABLE TIMER/COUNTER. Difference between 8253 and 8254 82538254 1Maximum input clock frequency is 2.6 MHz Maximum input clock frequency.
8254 SOFTWARE PROGRAMMABLE TIMER/COUNTER
