參數(shù)資料
型號： UPD17201AGF
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND A/D CONVERTER FOR INFRARED REMOTE CONTROL TRANSMITTERS
中文描述： 4位單片機(jī)與LCD控制器/驅(qū)動器和A / D轉(zhuǎn)換器紅外遙控遞質(zhì)
文件頁數(shù)： 45/120頁
文件大?。?/td> 516K
代理商： UPD17201AGF
μ
PD17201A, 17207
45
8.3
WATCHDOG TIMER OPERATION TIMING
Unless the watchdog timer is reset in a fixed time, the WDOUT pin outputs a low level. By connecting the WDOUT
pin to the RESET pin, a program hang-up can be detected by the watchdog timer.
To reset the watchdog timer, set WDTRES (WDTRES = 1).
To disable hang-up detection by the watchdog timer when the subclock is used, program so that WDTRES is set
at intervals of approximately 340 ms or less.
Cautions 1. The watchdog timer cannot be reset in the shaded range in Fig. 8-3. Therefore, set the
watchdog timer before both the f
W
/2
13
and f
W
/2
14
signals go high.
2. For further information on the WDOUT pin, also refer to 14. RESET.
Fig. 8-3 Watchdog Timer Operation Timing
Remark
Figures in the parentheses indicate the value when using the subclock.
f
w
/2
11
(16Hz)
f
w
/2
12
(8Hz)
f
w
/2
13
(4Hz)
f
w
/2
14
(2Hz)
INTWTM (at 4Hz)
INTWTM (at 16Hz)
WDOUT
Watchdog timer
reset signal
WDTRES
Setting WDTRES is invalid
during this period
WDOUT output goes low if WDTRES is not set
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