Intel 8255A, the Programmable Peripheral Interface (PPI) interfaces the peripheral components to the system bus for parallel data transfer. It is a general-purpose input/output device that can be used with almost all microprocessors. It can be used to transfer data under various conditions from simple input/output to interrupt input/output.
In this “Digital Interface - Microprocessors” you will learn about the following topics:
- Introduction to PPI (Programmable Peripheral Interface) Device 8255A
- Features of 8255A Programmable Peripheral Interface
- Pinout Diagram of 8255A PPI
- Internal Block Diagram (or Functional Block Diagram)
- Data Bus Buffer
- Read/write Control Logic
- RD' (Read Signal), WR' (Write Signal), CS' (Chip Select), A0 and A1, RESET
- Group A and Group B Controls
- 8255A Mode
- Input/output Modes
- Mode 0, Mode 1, Mode 2
- BSR Modes (Bit Set Reset Mode)
- Initialization and Generation of Control Words
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