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22.1 Functions of Power-on-Clear Circuit
The power-on-clear circuit (POC) has the following functions.
• Generates internal reset signal at power on.
• Compares supply voltage (V
when V
< V
.
DD
POC
Cautions 1. If an internal reset signal is generated in the POC circuit, the reset control flag register
(RESF) is cleared to 00H.
2. The supply voltage is V
but be sure to use the product in a voltage range of 2.2 to 5.5 V because the detection voltage
) of the POC circuit is 2.1 V ±0.1 V.
(V
POC
Remark This product incorporates multiple hardware functions that generate an internal reset signal. A flag that
indicates the reset cause is located in the reset control flag register (RESF) for when an internal reset
signal is generated by the watchdog timer (WDT), low-voltage-detection (LVI) circuit, or clock monitor.
RESF is not cleared to 00H and the flag is set to 1 when an internal reset signal is generated by WDT,
LVI, or the clock monitor.
For details of the RESF, refer to CHAPTER 20 RESET FUNCTION.
404
CHAPTER 22 POWER-ON-CLEAR CIRCUIT
) and detection voltage (V
DD
= 2.0 to 5.5 V when the Ring-OSC clock or subsystem clock is used,
DD
User's Manual U16899EJ2V0UD
= 2.1 V ±0.1 V), and generates internal reset signal
POC
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