参数资料
型号: ST62P09CM1/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封装: 0.300 INCH, PLASTIC, SOP-20
文件页数: 42/104页
文件大小: 1487K
代理商: ST62P09CM1/XXX
ST6208C/ST6209C/ST6210C/ST6220C
42/104
8 ON-CHIP PERIPHERALS
8.1 WATCHDOG TIMER (WDG)
8.1.1 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.
8.1.2 Main Features
s
Programmable timer (64 steps of 3072 clock
cycles)
s
Software reset
s
Reset (if watchdog activated) when the SR bit
reaches zero
s
Hardware or software watchdog activation
selectable by option bit (Refer to the option
bytes section)
Figure 25. Watchdog Block Diagram
RESET
C
7-BIT DOWNCOUNTER
fint /12
SR
T0
CLOCK DIVIDER
WATCHDOG REGISTER (WDGR)
÷ 256
T1
T2
T3
T4
T5
bit 0
bit 7
1
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