參數(shù)資料
型號: UPD17242UC-XXX-5A4
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 4.5 MHz, MICROCONTROLLER, PDSO30
封裝: 0.300 INCH, PLASTIC, SSOP-30
文件頁數(shù): 58/102頁
文件大小: 953K
代理商: UPD17242UC-XXX-5A4
59
Data Sheet U15002EJ1V1DS
PD17240, 17241, 17242, 17243, 17244, 17245, 17246
6.3
Operation Timing for Watchdog Timer
The basic interval timer can be used as a watchdog timer.
Unless the watchdog timer is reset within a fixed timeNote, it is judged that “the program has hung up”, and the
PD17246 is reset. It is therefore necessary to reset the watchdog timer via programming within the fixed time.
The watchdog timer can be reset by setting WDTRES to 1.
Note
Fixed time: Approx. 340 ms (at 4 MHz)
Caution The watchdog timer cannot be reset in the shaded range in Figure 6-2. Therefore, set WDTRES
before both the fX/221 and fX/220 signals go high.
Figure 6-2.
Watchdog Timer Operation Timing
fX/218
INTBTM (fX/220)
INTBTM (fX/218)
Reset signal
WDTRES
Watchdog timer
reset signal
Reset signal goes low
if WDTRES is not set
Setting WDTRES at
this timing is invalid
fX/219
fX/220
fX/221
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