Review Questions : 1. What is the necessity of the programmable interval timer? 2. List the features of any programmable interval timer. 3. List the differences between 8253 and 8254.
Features
1)
Three independent 16-bit down counters.
2)
8254 can handle inputs from DC to 10 MHz (5 MHz 8254-5 8 MHz 8254 10 MHz
8254-2) where as 8253 can operate upto 2.6 MHz.
3)
Three counters are identical, presettable and can be programmed for either
binary or BCD count.
4)
Counter can be programmed in six different modes.
5)
Compatible with all Intel and most other microprocessors.
6)
8254 has powerful command called READ BACK command which allows the user to
check the count value, programmed mode and current mode and current status of
the counter.
Review Questions
1. What is the
necessity of the programmable interval timer?
2. List the features
of any programmable interval timer.
3. List the differences between 8253 and 8254.
Microprocessors and Microcontrollers: Unit IV: (c) Programmable Interval Timer (PIT/C) 8253/8254 : Tag: : - Features