參數(shù)資料
型號(hào)： MB91302APFF-G-020-BNDE1
廠商： FUJITSU LTD
元件分類： 微控制器/微處理器
英文描述： 32-BIT, MROM, 68 MHz, RISC MICROCONTROLLER, PQFP144
封裝： 0.40 MM PITCH, PLASTIC, LQFP-144
文件頁數(shù)： 25/96頁
文件大?。?/td> 2641K
代理商： MB91302APFF-G-020-BNDE1
MB90520B Series
DS07-13707-5E
39
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
* : 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 : Reset due to recovery from hardware standby mode
3 : 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 pseudo-clock mode (clears the watchdog timer and temporarily halts the count) .
6 : Changing to clock mode (clears the watchdog timer and temporarily halts the count) .
7 : Changing to stop mode (clears the watchdog timer and temporarily halts the count) .
HCLK : Oscillation Clock (4 MHz)
SCLK : Sub-Clock (8.192 kHz)
Min
Max
Clock Period
Min
Max
Clock Period
Approx. 3.58 ms
Approx. 4.61 ms
214
± 211 / HCLK Approx. 0.438 s Approx. 0.563 s 212 ± 29 / SCLK
Approx. 14.33 ms
Approx. 18.30 ms
216
± 213 / HCLK Approx. 3.500 s Approx. 4.500 s 215 ± 212 / SCLK
Approx. 57.23 ms
Approx. 73.73 ms
218
± 215 / HCLK Approx. 7.000 s Approx. 9.000 s 216 ± 213 / SCLK
Approx. 458.75 ms Approx. 589.82 ms 221
± 218 / HCLK Approx. 14.00 s Approx. 18.00 s 217 ± 214 / SCLK
WTC : WDCS
HCLK : Oscillation clock
PCLK : PLL clock
SCLK : Sub-clock
“0”
Count the clock timer output.
“1”
Count the timebase timer output.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MB91302APFF-G-XXX-BNDE1 制造商:FUJI 制造商全稱:Fuji Electric 功能描述:32-Bit Proprietary Microcontroller
MB91302APM1R-G-020-BNDE1 制造商:FUJITSU 功能描述: 制造商:FUJITSU 功能描述:IC MCU 32BIT FR60 144LQFP 制造商:FUJITSU 功能描述:IC, MCU, 32BIT, FR60, 144LQFP
MB91302APM1R-G-020-JNE1 制造商:FUJITSU 功能描述:
MB91305 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller
MB91305PMC 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:32-bit Microcontroller
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