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AN1759

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
飞思卡尔 - FREESCALE		时钟
页数	文件大小	规格书
24页	477K
描述
Add a Non-Volatile Clock to the MC68HC705J1A

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Freescale Semiconductor

AN1759

Ad d a Non-Vola tile Cloc k to the MC68HC705J1A

By Mark Glenewinkel

Field Applications Engineering

Consumer Systems Group

Austin, Texas

Introd uc tion

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

Motorola, Inc., 1998

AN1759

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