10-09-2013, 03:50 PM
Introduction to Programmable Peripheral Interface 8255
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INTRODUCTION
The 8255 Programmable Peripheral Interface (PPI) is the general purpose interface device which is widely used in microprocessor design. It contains three independent 8 bit ports named Port A, B and C. Port A and B can be programmed as either input or output (all eight line must be same), while port C is split into two 4 bit halves (Port C upper (PC4-PC7) and Port C lower (PC0-PC3) that can be separately programmed as input or output.
[attachment=57839]
INTRODUCTION
The 8255 Programmable Peripheral Interface (PPI) is the general purpose interface device which is widely used in microprocessor design. It contains three independent 8 bit ports named Port A, B and C. Port A and B can be programmed as either input or output (all eight line must be same), while port C is split into two 4 bit halves (Port C upper (PC4-PC7) and Port C lower (PC0-PC3) that can be separately programmed as input or output.