UPD8255A-5 Description
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 instructions by the processor. Control Words and Status information are also transmitted via the Data Bus Buffer. Read/Write and Control Logic This block manages all of the...