rej05b0751_36077ap| Application Note
APPLICATION NOTE
H8/36077 Group
External Clock Backup Function
Introduction
This application note describes how to switch the clock source between the on-chip oscillator and the external clock. First, the on-chip oscillator, then the external clock is used as the clock source. Thereafter, when the LSI detects that the external oscillation is stopped, the external clock backup function switches the clock source back to the on-chip oscillator.
Target Device
H8/36077 Group MCU
Contents
1. 2. 3. 4. 5. 6. Specifications .................................................................................................................................... 2 Description of Functions Used .......................................................................................................... 3 Principles of Operation...................................................................................................................... 4 Description of Software..................................................................................................................... 6 Flowcharts......................................................................................................................................... 9 Program Listing............................................................................................................................... 11
REJ05B0751-0100
September 2005
Page 1 of 15
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