AN1759 datasheet(1/24 Pages) FREESCALE

Part #	AN1759

Description	Add a Non-Volatile Clock to the MC68HC705J1A

PDF	24 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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1 / 24 page

Motorola, Inc., 1998

AN1759

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AN1759

Add a Non-Volatile Clock to the MC68HC705J1A

By Mark Glenewinkel

Field Applications Engineering

Consumer Systems Group

Austin, Texas

Introduction

Many embedded systems require the measurement of time. This can be

accomplished internally by some MCUs that have on-chip real-time

clocks. Even so, for date, month, and leap year measurement, this task

can take substantial amounts of bandwidth and code space.

The DS1307 64x8 serial real-time clock provides calendar and time

keeping functions along with system-enhancing non-volatile RAM. With

a 2-wire interface, timekeeping can be managed easily.

Some applications of using the DS1307 are:

• Logging of chronological events

• Tracking power down time of a system

• Providing alarm functions

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