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| 型號： | HMS81C2012A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| 中文描述： | CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器 |
| 文件頁數(shù)： | 47/107頁 |
| 文件大小： | 1482K |
| 代理商： | HMS81C2012A |
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HMS81C2012A/2020A
SEP. 2004 Ver 2.00
43
Watchdog Timer Control
Figure 11-2 shows the watchdog timer control register.
The watchdog timer is automatically disabled after reset.
The CPU malfunction is detected during setting of the de-
tection time, selecting of output, and clearing of the binary
counter. Clearing the binary counter is repeated within the
detection time.
If the malfunction occurs for any cause, the watchdog tim-
er output will become active at the rising overflow from
the binary counters unless the binary counter is cleared. At
this time, when WDTON=1, a reset is generated, which
drives the RESET pin to low to reset the internal hardware.
When WDTON=0, a watchdog timer interrupt (WDTIF) is
generated.
The watchdog timer temporarily stops counting in the
STOP mode, and when the STOP mode is released, it au-
tomatically restarts (continues counting).
Figure 11-2 WDTR: Watchdog Timer Data Register
Example: Sets the watchdog timer detection time to 0.5 sec at 4.19MHz
7
6
5
4
3
2
1
0
Clear count flag
0: Free-run count
1: When the WDTCL is set to "1", binary counter
is cleared to “0”. And the WDTCL becomes “0” automatically
after one machine cycle. Counter count up again.
INITIAL VALUE: 0111_1111
B
ADDRESS: 0ED
H
WDTR
W
W
W
W
7-bit compare data
W
W
W
W
NOTE:
The WDTON bit is in register CKCTLR.
WDTCL
LDM
LDM
CKCTLR,#3FH
WDTR,#04FH
;
Select 1/2048 clock source
,
WDTON
←
1, Clear Counter
LDM
:
:
:
:
LDM
:
:
:
:
LDM
WDTR,#04FH
;
Clear counter
WDTR,#04FH
;
Clear counter
WDTR,#04FH
;
Clear counter
Within WDT
detection time
Within WDT
detection time
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| HMS81C2012AK | CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2012ALQ | CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2012AQ | INDUCTOR*100UH*0.73AMP*0.672OHM*15%*SURFACE MOUNT |
| HMS81C2020A | INDCTR, PWR, SMT 1.5UH, 15%, 6.9 A |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HMS81C2012AK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2012ALQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2012AQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2020A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
| HMS81C2020AK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver |
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