参数资料
型号: ST62P00CB3/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, PDIP16
封装: 0.300 INCH, PLASTIC, DIP-16
文件页数: 37/100页
文件大小: 1713K
代理商: ST62P00CB3/XXX
ST6200C ST6201C ST6203C
41/100
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
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
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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