The UPD8255A-5 by NEC is a PROGRAMMABLE PERIPHERAL INTERFACES. Below is the official datasheet preview.
| Part number | UPD8255A-5, UPD8255 |
|---|---|
| Manufacturer | NEC |
| File Size | 374.28 KB |
| Description | PROGRAMMABLE PERIPHERAL INTERFACES |
| Datasheet |
 UPD8255-NEC.pdf
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| Note |
This datasheet PDF includes multiple part numbers: UPD8255A-5, UPD8255. Please refer to the document for exact specifications by model. |
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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 internal and external transfers of Data, Control and Status.Through this block, the
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