hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 602

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Appendix B Internal I/O Registers
LVDSR—Low-Voltage Detection Status Register
Note: This register is implemented on the H8/38124 Group only.
Rev. 7.00 Mar 10, 2005 page 560 of 652
REJ09B0042-0700
Bit
Initial value
Read/Write
Note: * These bits initialized by resets trigged by LVDR.
OVF
R/W
0 *
LVD Reference Voltage Stabilized Flag
7
0 [Clearing condition]
1 [Setting condition]
When 0 is written after reading 1
When the low-voltage detection counter (LVDCNT) overflows
Reference Voltage External Input Select
0 The on-chip circuit is used to generate the reference
1 The reference voltage is input to the Vref pin from
R/W

6
0
voltage
an external source
LVD Power Supply Voltage Drop Flag
0 [Clearing condition]
1 [Setting condition]
R/W

5
0
When 0 is written after reading 1
When the power supply voltage drops below Vint(D)
LVD Power Supply Voltage Rise Flag
R/W
0 [Clearing condition]
1 [Setting condition]

4
0
When 0 is written after reading 1
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
VREFSEL
R/W
3
0
H'87
R/W

2
0
(initial value)
(initial value)
LVDDF
R/W
0 *
1
(initial v alue)
(initial value)
LVDUF
R/W
0 *
0
LVDC