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參數資料
| 型號： | HMS81C43XX |
| 廠商： | Hynix Semiconductor Inc. |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION |
| 中文描述： | CMOS單芯片8位單片機電視 |
| 文件頁數： | 77/100頁 |
| 文件大小： | 1943K |
| 代理商： | HMS81C43XX |
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HMS81C43xx / GMS87C4060
77
November 2001 ver 1.2
20. WATCHDOG TIMER
The watchdog timer rapidly detects the CPU malfunction
such as endless looping caused by noise or the like, and re-
sumes the CPU to the normal state.
The watchdog timer signal for detecting malfunction can
be selected either a reset CPU or a interrupt request.
When the watchdog timer is not being used for malfunc-
tion detection, it can be used as a timer to generate an in-
terrupt at fixed intervals.
Figure 20-1 Block Diagram of Watchdog Timer
Watchdog Timer Control
Figure 20-2 shows the watchdog timer control register.
The watchdog timer is automatically disabled after reset.
The CPU malfunction is detected as setting the detection
time, selecting output, and clearing the binary counter. Re-
peatedly clearing the binary counter within the setting de-
tection 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 are cleared.
At this time, when WDTON=1 a reset is generated, which
drives the RESET pin low to reset the internal hardware.
When WDTON=0, a watchdog timer interrupt (IFWDT) is
generated.
Figure 20-2 Watchdog timer register
to reset CPU
WDTR
Watchdog Timer Register
(BIT overflow : IFBIT)
Clock source
6-bit up-counter
enable
WDT
6-bit compare data
comparator
6
WDTR[bit5~0]
Watchdog Timer interrupt
WDTCL[bit6]
clear
[00D7
H
]
IFWDT
CKCTLR
Clock control Register
[00D6
H
]
WDTON[bit5]
CKTCLR
ADDRESS : 00D6
RESET VALUE : 0000 0000
b
W
W
R
ON
ENP
BTCL BTS2
BTS1
BTS0
Watchdog timer On/Off control
0: Normal 6bit timer, Watchdog off
1: Watchdog timer
W
W
W
WDTR
ADDRESS : 00D7
RESET VALUE : -011 1111
b
W
W
W
CL
W D T R 5 ~ 0
Slave address
W
W
W
W
Watchdog timer Clear
0: Watchdog timer free run
1: Watchdog timer clear and free run
Automatically cleared this bit after 1cycle
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相關代理商/技術參數 |
參數描述 |
|---|---|
| HMS81C4460 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS81C4X60 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS81C5216 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:REMOTE CONTROLLER |
| HMS87C1102 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS87C1102A | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
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