ST72101 datasheet(30/84 Pages) STMICROELECTRONICS

Part #	ST72101

Description	8-BIT MCU WITH 4 TO 8K ROM/OTP/EPROM, 256 BYTES RAM, ADC, WDG, SPI AND 1 OR 2 TIMERS

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ST72101/ST72212/ST72213

4.2 WATCHDOG TIMER (WDG)

4.2.1 Introduction

The Watchdog timer is used to detect the occur-

rence of a software fault, usually generated by ex-

ternal interference or by unforeseen logical condi-

tions, which causes the application program to

abandon its normal sequence. The Watchdog cir-

cuit generates an MCU reset on expiry of a pro-

grammed time period, unless the program refresh-

es the counter’s contents before the T6 bit be-

comes cleared.

4.2.2 Main Features

s

Programmable timer (64 increments of 12288

CPU cycles)

s

Programmable reset

s

Reset (if watchdog activated) after a HALT

instruction or when the T6 bit reaches zero

Figure 21. Watchdog Block Diagram

RESET

WDGA

7-BIT DOWNCOUNTER

fCPU

T6

T0

CLOCK DIVIDER

WATCHDOG CONTROL REGISTER (CR)

÷12288

T1

T2

T3

T4

T5

30

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