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.

Digital Interface - Microprocessors

In this “Digital Interface - Microprocessors” you will learn about the following topics:

  1. Introduction to PPI (Programmable Peripheral Interface) Device 8255A
  2. Features of 8255A Programmable Peripheral Interface
  3. Pinout Diagram of 8255A PPI
  4. Internal Block Diagram (or Functional Block Diagram)
  5. Data Bus Buffer
  6. Read/write Control Logic
  7. RD' (Read Signal), WR' (Write Signal), CS' (Chip Select), A0 and A1, RESET
  8. Group A and Group B Controls
  9. 8255A Mode
  10. Input/output Modes
  11. Mode 0, Mode 1, Mode 2
  12. BSR Modes (Bit Set Reset Mode)
  13. Initialization and Generation of Control Words

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BCA 3rd Semester Microprocessors Notes Pdf: