ST72E632K2B0 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72E632K2B0

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

5.3 WATCHDOG TIMER (WDG)

5.3.1 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.

Figure 22. Watchdog Block Diagram

5.3.2 Main Features

s Programmable timer (64 increments of 49152

CPU cycles)

s Programmable reset

s Reset (if watchdog activated) when the T6 bit

reaches zero

RESET

WDGA T6

WATCHDOG CONTROL REGISTER (CR)

T5 T4 T3 T2 T1 T0

7-BIT DOWNCOUNTER

fCPU

CLOCK DIVIDER

÷49152

33/109

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