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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