Overview

Product details

The XD8255-2 and XD82C55-5 are general purpose programmable input/output devices designedfor use with 8080/8085 microprocessors.Twenty-four I/O lines may be programmed in two groupsof twelve(group I and group II) and used in three modes of operation.In the basic mode,(Mode0),each group of twelve I/O pins may be programmed in sets of 4 to input or output.In the strobedmode,(MODE 1), each group may be programmed to have 8 lines of input or output.Three of the remaining four pins in each group are used for handshaking strobes and interrupt control signals.The bidirectional bus mode,(MODE 2),uses the 8 lines of port A for a bi-directional bus,and five lines from port C for bus control signals.