參數(shù)資料
型號(hào)： ST72372
廠商： 意法半導(dǎo)體
英文描述： 8-Bit MCUs with 16K ROM/OTP/EPROM, 512 Bytes RAM, ADC, DAC (PWM), Timer, IIC and SCI(8位微控制器(8M))
中文描述： 8 - 16K的光碟/雙層/存儲(chǔ)器，512字節(jié)RAM，ADC和DAC的器（PWM），定時(shí)器，IIC和脊髓損傷（8位微控制器（8米）位MCU）
文件頁數(shù)： 30/94頁
文件大?。?/td> 642K
代理商： ST72372
30/94
ST72371/ST72372
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
I
Programmable timer (64 increments of 49,152
CPU cycles)
I
Programmable reset
I
Reset (if watchdog activated) after a HALT
instruction or when the T6 bit reaches zero
Figure 16. Watchdog Block Diagram
RESET
WDGA
7-BIT DOWNCOUNTER
f
CPU
T6
T0
CLOCK DIVIDER
÷
49152
WATCHDOG CONTROL REGISTER(CR)
T1
T2
T3
T4
T5
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