CDP1851C

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ CMOS Perlph~rals TERMINAL ASSIGNMENT CL.OCI( cs RAD RAI BUSO BUSI BUS2 BUS3 BUS4 BUS5 .,.0e STROBE VDD RD/WE ".WR/liE A ROY A STROBE AD AI .A2 A3 A4 All ...A6 .7A7 .,, V55 .2 TOP VIEW 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 ...