Experiment-6: Generating Square wave with 8254 PIT 8086 Programming by Ravinder Nath Rajotiya - April 15, 2021May 6, 20220 AIM: Write a Program to generate a square wave using 8254. Write an assembly language program in 8085 microprocessor which generates 1 KHz square waveform by using counter 2 as a binary counter if clock frequency of 8254 is 2 MHz. Objective: To understand the mode of operation of 8254 To understnd the calculation of count value To develop the program for generating a square wave pulse using 8254 Assumption – Assume the port addresses are 8C01 H, 8C03 H, 8C05 H, 8C07 H for Counter-0, Counter-1, Counter-2, Control Register. Modes of Operation: 8254 can operate in six mode of operations. These are: Mode-0: Interrupt on Terminal Count –Mode 0 is typically used for event counting Mode-1: Hardware Retriggreable One Shot Mode-2: Rate Generator) –Initially value of OUT is low.
8254 Software-Programmable Timer/Counter Microprocessor and Interfacing by Ravinder Nath Rajotiya - March 26, 2020May 10, 20210 The Intel 8254 is a counter/timer device designed to solve the common timing control problems in microcomputer system design. It provides three independent 16-bit counters, each capable of handling clock inputs up to 10 MHz. All modes are software programmable. The 8254 uses HMOS technology and comes in a 24-pin plastic or CERDIP package. General The 8254 is a programmable interval timer/counter designed for use with Intel microcomputer systems. It is a general purpose, multi-timing element that can be treated as an array of I/O ports in the system software. The 8254 solves one of the most common problems in any microcomputer system, the generation of accurate time delays under software control. Instead of setting up timing loops in software, the programmer