ST6215C datasheet(43/105 Pages) STMICROELECTRONICS

部件名	ST6215C

功能描述	8-BIT MCUs WITH A/D CONVERTER, TWO TIMERS, OSCILLATOR SAFEGUARD & SAFE RESET

PDF	105 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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43 / 105 page

ST6215C/ST6225C

43/105

9 ON-CHIP PERIPHERALS

9.1 WATCHDOG TIMER (WDG)

9.1.1 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 SR bit be-

comes cleared.

9.1.2 Main Features

Programmable timer (64 steps of 3072 clock

cycles)

Software reset

Reset (if watchdog activated) when the SR bit

reaches zero

Hardware or software watchdog activation

selectable by option bit (Refer to the option

bytes section)

Figure 25. Watchdog Block Diagram

RESET

7-BIT DOWNCOUNTER

fint /12

CLOCK DIVIDER

WATCHDOG REGISTER (WDGR)

÷ 256

bit 0

bit 7

ST6215C 数据表(PDF) 43 Page - STMicroelectronics