參數(shù)資料
型號： MB90562A
廠商： Fujitsu Limited
英文描述： 16-bit Proprietary Microcontrollers(16位微控制器)
中文描述： 16位微控制器專利（16位微控制器）
文件頁數(shù)： 34/91頁
文件大小： 931K
代理商： MB90562A
MB90560/565 Series
34
3.
Watchdog Timer
The watchdog timer is a timer/counter used to detect faults such as program runaway.
The watchdog timer is a 2-bit counter that counts the clock signal from the timebase timer or clock timer.
Once started, the watchdog timer must be cleared before the 2-bit counter overflows. If an overflow occurs,
the CPU is reset.
Interval time for the watchdog timer
Notes :
The difference between the maximum and minimum watchdog timer interval times is due to the timing when
the counter is cleared.
As the watchdog timer is a 2-bit counter that counts the carry-up signal from the timebase timer or clock
timer, clearing the timebase timer (when operating on HCLK) or the clock timer (when operating on SCLK)
lengthens the time until the watchdog timer reset is generated.
Watchdog timer count clock
Events that stop the watchdog timer
1 : Stop due to a power-on reset
2 : Watchdog reset
Events that clear the watchdog timer
1 : External reset input from the RST pin.
2 : Writing “0” to the software reset bit.
3 : Writing “0” to the watchdog control bit (second and subsequent times) .
4 : Changing to sleep mode (clears the watchdog timer and temporarily halts the count) .
5 : Changing to timebase timer mode (clears the watchdog timer and temporarily halts the count) .
6 : Changing to stop mode (clears the watchdog timer and temporarily halts the count) .
HCLK : Oscillation Clock (4 MHz)
Min.
Max.
Clock Period
2
14
±
2
11
/
HCLK
2
16
±
2
13
/
HCLK
2
18
±
2
15
/
HCLK
2
18
±
2
15
/
HCLK
Approx. 3.58 ms
Approx. 4.61 ms
Approx. 14.33 ms
Approx. 18.30 ms
Approx. 57.23 ms
Approx. 73.73 ms
Approx. 458.75 ms
Approx. 589.82 ms
WTC : WDCS
HCLK : Oscillation clock
PCLK : PLL clock
“0”
Prohibited setting
“1”
Count the timebase timer output.
相關(guān)PDF資料
PDF描述
MB90567 16-bit Proprietary Microcontrollers(16位微控制器)
MB90568 16-bit Proprietary Microcontrollers(16位微控制器)
MB90570 Hex Schmitt-trigger Inverters 14-CDIP -55 to 125
MB90580C 16-bit Proprietary Microcontroller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB90562AP 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontrollers
MB90562APF 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontrollers
MB90562APFM 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontrollers
MB90562APMC 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontrollers
MB90562P 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontrollers
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