参数资料
型号: TMP86CH09NG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, 1.78 MM PITCH, LEAD FREE, PLASTIC, SDIP-32
文件页数: 89/120页
文件大小: 1743K
代理商: TMP86CH09NG
Page 59
TMP86FH09ANG
7. Watchdog Timer (WDT)
The watchdog timer is a fail-safe system to detect rapidly the CPU malfunctions such as endless loops due to spu-
rious noises or the deadlock conditions, and return the CPU to a system recovery routine.
The watchdog timer signal for detecting malfunctions can be programmed only once as “reset request” or “inter-
rupt request”. Upon the reset release, this signal is initialized to “reset request”.
When the watchdog timer is not used to detect malfunctions, it can be used as the timer to provide a periodic inter-
rupt.
Note: Care must be taken in system design since the watchdog timer functions are not be operated completely due to
effect of disturbing noise.
7.1 Watchdog Timer Configuration
Figure 7-1 Watchdog Timer Configuration
0034H
Overflow
WDT output
Internal reset
Binary counters
WDTOUT
Writing
clear code
Writing
disable code
WDTEN
WDTT
2
0035H
Watchdog timer control registers
WDTCR1
WDTCR2
INTWDT
interrupt
request
Interrupt request
Reset
request
Reset release
Clock
Clear
1
2
Controller
Q
SR
S
R
Q
Selector
fc/223 or fs/215
fc/221 or fs/213
fc/219 or fs/211
fc/217 or fs/29
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