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CDP1879 - CMOS Real-Time Clock

Description

The CDP1879 real-time clock supplies time and calendar information from seconds to months in BCD format.

It consists of 5 separately addressable and programmable counters that divide down an oscillator input.

Features

  • CPU Interface for Use with General-Purpose Microprocessors.
  • Time Of Day/Calendar.
  • Reads Seconds, Minutes, Hours.
  • Reads Day of Month and Month.
  • Alarm Circuit With Seconds, Minutes or Hours Operation.
  • Power Down Mode.
  • Separate Clock Output Selects 1 of 15 Square Wave Signals.
  • Interrupt Output Activated By Clock Output and/or Alarm Circuit.
  • Date Integrity Sampling for Clock Rollover Eliminated.
  • On-Board Oscil.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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CDP1879, CDP1879C-1 March 1997 CMOS Real-Time Clock Description The CDP1879 real-time clock supplies time and calendar information from seconds to months in BCD format. It consists of 5 separately addressable and programmable counters that divide down an oscillator input. The clock input can have any one of 4 possible frequencies, allowing flexibility in the choice of crystal or external clock sources. Using an external 32kHz clock source, timekeeping can be performed down to 2.5V (see Standby (Timekeeping) Voltage Operation). The device can be memory-mapped for use with any general-purpose microprocessor and has the additional capability of operating in the CDP1800 series input/output mode.
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