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MB90330A Datasheet(PDF) 41 Page - Fujitsu Component Limited.

Part # MB90330A
Description  16-bit Microcontroller
Download  120 Pages
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Manufacturer  FUJITSU [Fujitsu Component Limited.]
Direct Link  http://edevice.fujitsu.com/fmd/en/index.html
Logo FUJITSU - Fujitsu Component Limited.

MB90330A Datasheet(HTML) 41 Page - Fujitsu Component Limited.

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MB90330A Series
41
3.
Watchdog timer
The watchdog timer is timer counter provided for measure of program runaway. It is a 2-bit counter operating
with an output of the timebase timer or watch timer as the count clock and resets the CPU when the counter is
not cleared for a preset period of time after start.
• Interval time of watchdog timer
Notes :
• The maximum and minimum time intervals for the watchdog timer depend on the counter clear timing.
• The watchdog timer contains a 2-bit counter that counts the carry-up signal from the time-base timer or
watch timer.
• Interval time of watchdog timer is longer than the set time during the following conditions.
- When clearing the timebase timer during operation on oscillation (HCLK)
- When clearing the watch timer during operation on sub clock (SCLK)
• Events that stop the watchdog timer
• Stop due to a power-on reset
• Watchdog reset
• Clear factor of watchdog timer
• External reset input by RST pin
• Writing “0” to the software reset bit
• Writing “0” to the watchdog timer control bit (second and subsequent times)
• Transition to sleep mode (clearing the watchdog timer to suspend counting)
• Transition to time-base timer mode (clearing the watchdog timer to suspend counting)
• Transition to stop mode (clearing the watchdog timer to suspend counting)
HCLK : Oscillation clock(6 MHz) SCLK : Sub clock(8 kHz)
Min
Max
Clock cycle
Approx. 2.39 ms
Approx. 3.07 ms
(214
± 211) /HCLK
Approx. 9.56 ms
Approx. 12.29 ms
(216
± 213) /HCLK
Approx. 38.23 ms
Approx. 49.15 ms
(218
± 215) /HCLK
Approx. 305.83 ms
Approx. 393.22 ms
(221
± 218) /HCLK
Approx. 0.448 s
Approx. 0.576 s
(212
± 29) /SCLK
Approx. 3.584 s
Approx. 4.608 s
(215
± 212) /SCLK
Approx. 7.168 s
Approx. 9.216 s
(216
± 213) /SCLK
Approx. 14.336 s
Approx. 18.432 s
(217
± 214) /SCLK


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