Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Rev. 7.00 Mar 10, 2005 page 438 of 652
REJ09B0042-0700
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.
Bit 7
LVDE Description
0 Low-voltage detection circuit not used (standby status) (initial value)
1 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.
Bit 5
VINTDSEL Description
0 LVDD detection level generated by on-chip ladder resistor (initial value)
1 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.
Bit 4
VINTUSEL Description
0 LVDU detection level generated by on-chip ladder resistor (initial value)
1 LVDU detection level input to extU pin
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