HE84G762B datasheet(39/60 Pages) KB

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KING BILLION ELECTRONICS CO., LTD

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HE84G762B

HE80004 Series

June 1, 2004

V0.92

This specification is subject to change without notice. Please contact sales person for the latest version before use.

TBS[3..0]

Interrupt Frequency

1001

32 Hz

1010

16 Hz

1011

8 Hz

1100

4 Hz

1101

2 Hz

1110

1 Hz

1111

0.5 Hz

17. Watch Dog Timer

Watch Dog Timer (WDT) is designed to reset system automatically and prevents system dead lock caused

by abnormal hardware activities or program execution. The WDT needs to be enabled in Mask Option.

MO_WDTE

Function

WDT disable

WDT enable

Using the WDT function, the “CLRWDT” instruction needs to be executed in every possible program

path when the program runs normally in order to clears the WDT counter before it overflows, so that the

program can operate normally. When abnormal conditions happen to cause the MCU to divert from

normal path, the WDT counter will not be cleared and reset signal will be generated to reset the system.

The WDT clock source is the same as TC1 (Timer1 clock), and the WDT reset signal is generated when

the counter had counted 32768 clock. The WDT can function in Normal, Slow and Idle Mode. However,

WDT will not function during Sleep Mode (as the TC1 clock has stopped.)

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