The Intel A is a general purpose programmable I/O device designed for use with Intel microprocessors The A is a programmable peripheral interface. Intel A: Programming and Operating Modes. Operation Description: There are three basic modes of operation that can be selected by the system software. simpler, Intel has designed A chip to interface I/O devices. The Intel A is a general purpose programmable I/O device designed for use with Intel.

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It accepts the input from the CPU address and control buses. This gives command to both the control groups. These input signals work with RD, WR, and one of the control signal.

Following is the table showing their various signals with their result. It is a tri-state 8-bit bidirectional data buffer, which helps in interfacing the microprocessor to the system data bus. Data is transmitted or received by the buffer with the input output instructions given by the CPU.


Control words and status information is also transferred using this bus. It stands for Chip Select. It is active-low signal that enables the communication between the A and the CPU. It stands for write. This control signal obviously enables the write operation. This is an active high signal.

The control register is cleared by this signal and sets all ports in the input mode. It stands for Read option. This control signal helps to perform the Read operation. Jobs in Meghalaya Jobs in Shillong. Making a great Resume: How to design your resume?

8255A – Programmable Peripheral Interface

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Intel 8255

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Intel A Pin Description

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