Preliminary User’s Manual U17260EJ3V1UD
530
CHAPTER 23 POWER-ON-CLEAR CIRCUIT
23.1 Functions of Power-on-Clear Circuit
The power-on-clear circuit (POC) has the following functions.
•
Generates internal reset signal at power on.
In the 1.59 V POC mode (option byte: POCMODE = 0), the reset signal is released when the supply voltage
(V
DD
) exceeds 1.59 V
±
0.15 V.
In the 2.7 V/1.59 V POC mode (option byte: POCMODE = 1), the reset signal is released when the supply
voltage (V
DD
) exceeds 2.7 V
±
0.2 V.
•
Compares supply voltage (V
DD
) and detection voltage (V
POC
= 1.59 V
±
0.15 V), generates internal reset signal
when V
DD
< V
POC
, and releases reset when V
DD
≥
V
POC
.
Caution If an internal reset signal is generated in the POC circuit, the reset control flag register (RESF)
is cleared to 00H.
Remark
This product incorporates multiple hardware functions that generate an internal reset signal. A flag
that indicates the reset source is located in the reset control flag register (RESF) for when an internal
reset signal is generated by the watchdog timer (WDT) or low-voltage-detector (LVI). RESF is not
cleared to 00H and the flag is set to 1 when an internal reset signal is generated by WDT or LVI.
For details of RESF, see
CHAPTER 22 RESET FUNCTION
.
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