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參數(shù)資料
| 型號(hào)： | UPD17217 |
| 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(jī)的小型通用紅外遙控器 |
| 文件頁(yè)數(shù)： | 38/84頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | UPD17217 |
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μ
PD17215, 17216, 17217, 17218
38
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*, it judges that “the program has hung up”, and the
μ
PD17215 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.
*: Fixed time: approx. 340 ms (at 4 MHz)
Coutions 1:
The watchdog timer cannot be reset in the shaded range in Fig. 6-2. Therefore, set WDTRES
before both the f
x
/2
21
and f
x
/2
20
signals go high.
Refer to 9. RESET for the WDOUT pin function.
2:
Fig. 6-2 Watchdog Timer Operation Timing
f /2
X
18
INTBTM (f /2 )
INTBTM (f /2 )
WDOUT
WDTRES
Watchdog timer
reset signal
WDOUT output goes low
if WDTRES is not set
Setting WDTRES at
this timing is invalid
f /2
X
19
f /2
X
20
f /2
X
21
X
X
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UPD17217CT | 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 |
| UPD17217GT | 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 |
| UPD17218 | 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 |
| UPD17218CT | 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 |
| UPD17218GT | 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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