WRST of the WDTC register is set. What status is that when power supply is suddenly turned off?
• Answer :When power supply voltage is suddenly lowered, a WDTC register value is unpredictable (this, however, depends on the lowered voltage). The value is currently set. This is because, as the cause of operation resulting from lowered power supply (operation not guaranteed), it cannot be determined whether WDT is active or a register value is garbled. When the power supply monitoring IC is used and power supply is lowered, the ERST bit of the WDTC register is set. So, this bit can be used to confirm that power supply is lowered.
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