UPD8255A-5 interfaces equivalent, programmable peripheral interfaces.
unique to each of the ports.
Port A = An 8-bit data output latch/buffer and data input latch. Port B = An 8-bit data input/output latch/buffer and an 8-bit data input buf.
Data Bus Buffer
The 3-state, bidirectional, eight bit Data Bus Buffer (DO-D71 of the .uPD8255 and .uPD8255A-5 can be directly interfaced to the processor's system Data Bus (DO-D7)The Data Bus Buffer is controlled by execution of IN and OUT instructi.
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