8255 – PROGRAMMABLE PARALLEL

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Presentation transcript:

8255 – PROGRAMMABLE PARALLEL PORT DEVICE

METHODS OF PARALLEL DATA TRANSFER SIMPLE INPUT AND OUTPUT SIMPLE STROBE I/O SINGLE-HANDSHAKE I/O DOUBLE HANDSHAKE I/O

HANDSHAKE INPUT DATA TRANSFER SIGNAL DIRECTIONS MICRO- PROCESSOR PORT DEVICE PERIPHERAL PARALLEL DATA LINES STB ACK

Need of 8255 The parallel port device 8255 has been designed to automatically manage the handshake operation. Eg, it can be programmed to automatically receive an Strobe signal from a peripheral, send an int signal to the processor and send the ACK signal back to the peripheral at proper times

8255 – Internal block diagram

Note: 8255 is often used in mode 1

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