Fujitsu FR81S Manual Do Utilizador
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CHAPTER 18: WATCHDOG TIMER
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : WATCHDOG TIMER
FUJITSU SEMICONDUCTOR CONFIDENTIAL
18
5.1.1. Settings
This section explains settings of the software watchdog function.
Before activating the watchdog timer 0, set bits 3 to 0: WT[3:0] of the register WDTCR0 in order to select
the period starting from clearing the watchdog timer to issuing the reset request.
Since the watchdog timer 0 counts only when the CPU is operating, set the period on the basis of the
number of program steps and the clock division setting.
Before activating the watchdog timer 0, set bit6: RSTP of the register WDTCR0 in order to select whether
or not to generate a reset signal when a transition to watch mode or stop mode is detected.
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When RSTP=0, the timer stops in watch mode or stop mode.
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When RSTP=1, a reset signal is generated as soon as the CPU enters watch mode or stop mode.
If the device is used in watch mode or stop mode, set RSTP=0. Writing to the RSTP bit is invalid after the
watchdog timer 0 is activated.
MB91520 Series
MN705-00010-1v0-E
627