參數(shù)資料
型號(hào)： UPD17231MC
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)： 48/92頁(yè)
文件大?。?/td> 378K
代理商： UPD17231MC
Data Sheet U14360EJ1V0DS00
μ
PD17230, 17231, 17232, 17233, 17234, 17235, 17236
48
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
PD17236 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)
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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UPD17232 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
UPD17232MC 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
UPD17233 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
UPD17233MC 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
UPD17234 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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