Renesas H8 Series Hardware Manual page 480

8-bit single-chip microcomputer

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Table of Contents

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)

LVDCR is an 8-bit read/write register. It is used to control whether or not the low-voltage

detection circuit is used, settings for external input of power supply rise and drop detection

voltages, the LVDR detection level setting, enabling or disabling of resets triggered by the low-

voltage detection reset circuit (LVDR), and enabling or disabling of interrupts triggered by power

supply voltage drops or rises.

Bit 7—LVD Enable (LVDE)

This bit is used to control whether or not the low-voltage detection circuit is used.

Low-voltage detection circuit not used (standby status)

Low-voltage detection circuit used

Bit 6—Reserved

This bit is a read/write enabled reserved bit.

Bit 5—Power Supply Drop (LVDD) Detection Level External Input Select (VINTDSEL)

This bit is used to select the power supply drop detection level.

LVDD detection level generated by on-chip ladder resistor

LVDD detection level input to extD pin

Bit 4—Power Supply Rise (LVDU) Detection Level External Input Select (VINTUSEL)

This bit is used to select the power supply rise detection level.

LVDU detection level generated by on-chip ladder resistor

LVDU detection level input to extU pin

Rev. 7.00 Mar 10, 2005 page 438 of 652

REJ09B0042-0700

(initial value)