8255 Programmable Peripheral Interface

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Presentation transcript:

8255 Programmable Peripheral Interface

8255 It is a programmable peripheral Interface with three i/o ports A 8 bits B 8 bits C 4 bits upper and 4 bits lower

Pin diagram 8255

CS (Chip Select) RD (Read) WR (Write) D0-D7 (Data Bus) A0,A1 (Address) 8 bit i/o ports PA, PB, PC (Port A,B,C) CS (Chip Select) A low signal at this pin enables the chip RD (Read) Read enable WR (Write) Write enable Bi-directional data lines D0-D7 (Data Bus) A0,A1 (Address) Address select

8255 The 8255 can work in 2 modes that are I/O mode and BSR mode i/o mode is further divided in to 1. Mode 0 (Basic I/O) 2. Mode 1 (Strobe I/O) 3. Mode 2 (Bi - Conditional Bus)

Control Bytes for I/O mode 1 Control Bytes for I/O mode Group B Port C (lower) 1 = input 0 = output Port B 1 = input 0 = output Mode selection 00 = mode 0 01 = mode 1 1x = mode 2 Group A Port C (upper) 1 = input 0 = output Port A 1 = input 0 = output Mode selection 00 = mode 0 01 = mode 1 1x = mode 2