CMOS Programmable I/O Interface
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Description
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9~CS~31926
4G-LEAO OIL PACKAGES
CDP1851, CDP1851C
CMOS Programmable 1/0 Interface
Features: 20 Programmable 110 Lines Programmable for Operation in Four Modes:
Input Output Bidirectional Bit-programmable Operates in Either I/O or Memory Space
The RCA CDP1851 and CDP1851C are CMOS programmable two-port I/Os designed for use as general-purpose 1/0 devices. They are directly compatible 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, ROY and ...
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