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參數(shù)資料
| 型號： | UPD17245MC-xxx-5A4 |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| 中文描述： | 4位單片微控制器的小型通用兩用紅外遙控遞質(zhì) |
| 文件頁數(shù)： | 59/102頁 |
| 文件大小： | 461K |
| 代理商： | UPD17245MC-XXX-5A4 |
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59
Data Sheet U15002EJ1V0DS
μ
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 time
Note
, it is judged that
“
the program has hung up
”
, and the
μ
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 f
X
/2
21
and f
X
/2
20
signals go high.
Figure 6-2. Watchdog Timer Operation Timing
f
X
/2
18
INTBTM (f
X
/2
20
)
INTBTM (f
X
/2
18
)
Reset signal
WDTRES
Watchdog timer
reset signal
Reset signal 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17246 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontrollers for Remote Controllers Pamphlet | Pamphlet[11/2002] |
| UPD17246MC-XXX-5A4 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD1724X | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLERS FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTERS |
| UPD17704 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLERS WITH DEDICATED HARDWARE FOR DIGITAL TUNING SYSTEM |
| UPD17704A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UPD17704A.17705A.17707A.17708A.17709A Data Sheet | Data Sheet[10/2001] |
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