參數(shù)資料
型號: ST72141K2B3/XXX
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封裝: 0.400 INCH, PLASTIC, SDIP-32
文件頁數(shù): 107/133頁
文件大?。?/td> 2615K
代理商: ST72141K2B3/XXX
Obsolete
Product(s)
- Obsolete
Product(s)
ST72141K2
75/133
8.2 WATCHDOG TIMER (WDG)
8.2.1 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.
8.2.2 Main Features
Programmable timer (64 increments of 12288
CPU cycles)
Programmable reset
Reset (if watchdog activated) after a HALT
instruction or when the T6 bit reaches zero
Watchdog Reset indicated by status flag
Figure 44. Watchdog Block Diagram
RESET
WDGA
7-BIT DOWNCOUNTER
fCPU
T6
T0
CLOCK DIVIDER
WATCHDOG CONTROL REGISTER (CR)
÷ 12288
T1
T2
T3
T4
T5
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