參數(shù)資料
型號: ST72311N4T6/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, PQFP64
封裝: PLASTIC, TQFP-64
文件頁數(shù): 25/92頁
文件大小: 624K
代理商: ST72311N4T6/XXX
31/92
ST72311
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
s
Hardware Watchdog selectable by option byte.
s
Watchdog Reset indicated by status flag (in
versions with Safe Reset option only)
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
31
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