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MSM6542-03

OKI electronic componets
Part Number MSM6542-03
Manufacturer OKI electronic componets
Description (MSM6542-01/-02/-03) REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT
Published Nov 24, 2008
Detailed Description ¡ Semiconductor MSM6542-01/02/03 MSM6542-01/02/03 DESCRIPTION The MSM6542 is a perpetual-calendar-based real time clock ...
Datasheet PDF File MSM6542-03 PDF File

MSM6542-03
MSM6542-03

Overview
¡ Semiconductor MSM6542-01/02/03 MSM6542-01/02/03 DESCRIPTION The MSM6542 is a perpetual-calendar-based real time clock with an alarm function which can read and write data in units of seconds.
It can be connected to various buses and can function as a peripheral IC of a microcomputer.
The clock ranges are seconds, minutes, hours, days, months, years, and days of the week.
The alarm ranges are seconds, minutes, hours, www.
DataSheet4U.
com days, months, and days of the week.
An event trigger is generated when the time matches the specified time and an alarm occurs or when the clock counter generates a carry.
The interrupt and pulse outputs are provided for each of an alarm and a carry.
An interface with a microcomputer is implemented by four data bus pins, four address bus ¡ Semiconductor REAL TIME CLOCK WITH PERIODIC AND ALARM OUTPUT bus pins, three control bus pins, and two chip select pins.
These pins are used to write or read data from the clock, alarm, and control registers, or to modify the data.
The MSM6542 has an address latch enable (ALE) input pin, allowing the data bus and address bus to be shared.
When the ALE input pin is kept high, the data bus and address bus can be exclusively used.
Other functions of the MSM6542 are: a 30second adjustment, stop and restart of clock, data registers as RAM, and data register (RAM) protection.
The CMOS circuitry used in the MSM6542 affords low power dissipation.
The crystal oscillator operates at 32.
768 kHz.
Provisions for backup time keeping are included.
FEATURES • Real time clock providing seconds, minutes, hours, days, months, years, and days of the week.
• Multiple alarm ranges covering seconds, minutes, hours, days, months, and days of the week.
A desired alarm range can be selected.
• A periodic interrupt output interval can be selected over a wide range from 1/1024 seconds up to 10 minutes.
• Interface flexibility allows for connection to many types of microprocessors.
• Single read-out procedure (Read flag).
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