What does PPI and PIC stand for? Draw the internal architecture of 8255 PPI and discuss its ports.

Subject Peripheral and Interfacing
NU Year Set: 1.(d) Marks: 6 Year: 2017

Programmable Peripheral Interface (82C55)
 
  • The 82C55 is a popular interfacing component, that can interface any TTL-compatible I/O device to the microprocessor.
 
  • It is used to interface to the keyboard and a parallel printer port in PCs (usually as part of an integrated chipset).
 
  • Requires insertion of wait states if used with a microprocessor using higher that an 8 MHz clock.
 
  • PPI has 24 pins for I/O that are programmable in groups of 12 pins and has three distinct modes of operation.
    

 A peripheral interface controller (PIC) is a type of microcontroller component that is used in the development of electronics, computers, robotics and similar devices.

 Here is the internal architecture of 8255 PPI


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