Chapter 23 Power-On-Clear Circuit; Functions Of Power-On-Clear Circuit - NEC V850E/RS1 User Manual

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.
• Compares supply voltage (V
Caution:
Remark:
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Chapter 23 Power-On-Clear Circuit

signal when V < V .
DD POC
If an internal reset signal is generated by the POC circuit, the reset source flag
register (RESF) is cleared to 00H.
This product has several hardware functions that generate an internal reset signal. When an
internal reset signal is generated by the watchdog timer (WDT2RES), the low-voltage-
detection (LVI) circuit, or clock monitor (CLM), a flag located in the reset control flag register
(RESF) identifies the reset source. If an internal reset signal is generated by WDT2RES,
LVI, or the clock monitor.RESF is not cleared to 00H but the corresponding flag is set to 1.
For details of the RESF, refer to Chapter 19 "RESET Function" on page 735.
User's Manual U16702EE3V2UD00
) and detected voltage (V
DD
), and generates internal reset
POC
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