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參數(shù)資料
| 型號： | UPD17228MC |
| 廠商： | NEC Corp. |
| 元件分類： | 4位微控制器 |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| 中文描述： | 4位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 39/84頁 |
| 文件大?。?/td> | 393K |
| 代理商： | UPD17228MC |
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μ
PD17225, 17226, 17227, 17228
39
Data Sheet U12643EJ2V0DS00
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 time
Note
, it judges that “the program has hung up”, and the
μ
PD17225
is reset. It is therefore necessary to reset through programming the watchdog timer with in a fixed time.
The watchdog timer can be reset by setting WDTRES to 1.
Note
Fixed time: approx. 340 ms (at 4 MHz)
Cautions 1. The watchdog timer cannot be reset in the shaded range in Figure 6-2. Therefore, set
WDTRES before both the f
X
/2
21
and f
X
/2
20
signals go high.
2. Refer to 9. RESET for the WDOUT pin function.
Figure 6-2. Watchdog Timer Operation Timing
f
X
/2
18
INTBTM (f
X
/2
20
)
INTBTM (f
X
/2
18
)
WDOUT
WDTRES
Watchdog timer
reset signal
WDOUT output goes low
if WDTRES is not set
Setting WDTRES at
this timing is invalid
f
X
/2
19
f
X
/2
20
f
X
/2
21
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