EB413 Datasheet, PDF (1/12 Pages) Motorola, Inc – Resetting MCUs

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Motorola Semiconductor Engineering Bulletin
EB413
Resetting MCUs
By Ross Mitchell
MCU Applications
Motorola Ltd.
East Kilbride, Scotland
Introduction
A simple function such as reset can cause many problems since
different applications impose very different conditions on the start up and
power down of the microcontroller unit (MCU). This document covers the
main issues relating to reset and aims to lead the user of the M68HC05
and M68HC11 devices to a safe a reliable approach for the application.
Reset in its most basic function ensures that the MCU starts executing
code in a controlled manner once power is applied. It may also be used
to prevent the device running out of specification (often in conjunction
with external devices) and can cause a system reset at the board level
whenever the MCU has not executed the code in the expected way
(watchdog).
© Motorola, Inc., 1993, 2000
EB413
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