Datasheet

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Rev. 8.00 Mar. 09, 2010 Page 437 of 658
REJ09B0042-0800
Bits 6 to 4—Reserved
These bits are read/write enabled reserved bits.
Bit 3—Reference Voltage External Input Select (VREFSEL)
This bit is used to select the reference voltage.
Bit 3
VREFSEL Description
0 The on-chip circuit is used to generate the reference voltage (initial value)
1 The reference voltage is input to the Vref pin from an external source
Bit 2—Reserved
This bit is reserved. It is always read as 0 and cannot be written to.
Bit 1—LVD Power Supply Voltage Drop Flag (LVDDF)
This bit indicates when a power supply voltage drop has been detected.
Bit 1
LVDDF Description
0 [Clearing condition] (initial value)
When 0 is written after reading 1
1 [Setting condition]
When the power supply voltage drops below Vint(D)
Bit 0—LVD Power Supply Voltage Rise Flag (LVDUF)
This bit indicates when a power supply voltage rise has been detected.
Bit 0
LVDUF Description
0 [Clearing condition]
When 0 is written after reading 1 (initial value)
1 [Setting condition]
When the power supply voltage drops below Vint(D) while the LVDUE bit in
LVDCR is set to 1, and it rises above Vint(U) before dropping below Vreset1