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CDP1851 - 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 compatible with CDP1800-series microprocessors functioning at maximum clock frequency.

Features

  • 20 Programmable I/O Lines.
  • Programmable for Operation in Four Modes: - Input - Output - Bidirectional - Bit-programmable.
  • Operates in Either I/O or Memory Space Ordering Information.

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Datasheet preview – CDP1851

Datasheet Details

Part number CDP1851
Manufacturer Intersil
File Size 56.88 KB
Description CMOS Programmable I/O Interface
Datasheet download datasheet CDP1851 Datasheet
Additional preview pages of the CDP1851 datasheet.

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Full PDF Text Transcription

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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 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, RDY and STROBE. Only port A can be programmed to be a bidirectional port. This configuration provides a means for communicating with a peripheral device or microprocessor system on a single 8-bit bus for both transmitting and receiving data.
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