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參數(shù)資料
| 型號(hào)： | UPD17225MC |
| 廠商： | NEC Corp. |
| 元件分類(lèi)： | 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(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 39/84頁(yè) |
| 文件大小： | 393K |
| 代理商： | UPD17225MC |
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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
相關(guān)PDF資料 |
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| UPD17226 | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17226CT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17226GT | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17226MC | 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17225MC-XXX-5A4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| UPD17226 | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17226CT | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
| UPD17226CT-XXX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| UPD17226GT | 制造商:NEC 制造商全稱:NEC 功能描述:4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER |
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