CDP1851 Datasheet | Intersil

CDP1851, CDP1851C March 1997 CMOS Programmable I/O Interface Description THE CDP1851 and CDP1851C are CMOS programmable twoport I/Os designed for use as general-purpose I/O devices. They are directly patible with CDP1800-series microprocessors functioning at maximum clock frequency. Each port can be programmed in either byte-I/O or bit-programmable modes for interfacing with peripheral devices such as printers and keyboards. Both ports A and B can be separately programmed to be 8-bit input or output ports with handshaking control lines, RDY and STROBE. Only port A can be programmed to be a bidirectional port. This configuration provides a means for municating with a peripheral device...