hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 482

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

Section 14 Power-On Reset and Low-Voltage Detection Circuits (H8/38124 Group Only)
Table 14.3 shows the relationship between LVDCR settings and function selections. Refer to table
14.3 when making settings to LVDCR.
Table 14.3 LVDCR Settings and Function Selections
LVDE
0
1
1
1
1
Note: Setting values marked with an asterisk (*) are invalid.
14.2.2
Note: * These bits initialized by resets trigged by LVDR.
LVDSR is an 8-bit read/write register. It is used to control external input selection, indicates when
the reference voltage is stable, and indicates if the power supply voltage goes below or above a
specified range.
Bit 7—LVD Reference Voltage Stabilized Flag (OVF)
This bit indicates when the low-voltage detection counter (LVDCNT) overflows.
Bit 7
OVF
0
1
Rev. 7.00 Mar 10, 2005 page 440 of 652
REJ09B0042-0700
Bit
Initial value
Read/Write
LVDSEL LVDRE
*
1
0
0
0
Low-Voltage Detection Status Register (LVDSR)
LVDCR Setting Value
Description
[Clearing condition]
When 0 is written after reading 1
[Setting condition]
When the low-voltage detection counter (LVDCNT) overflows
*
1
0
0
1
OVF
R/W
0 *
7
LVDDE LVDUE
*
0
1
1
1
R/W
—
6
0
*
0
0
1
1
R/W
—
5
0
Power-on
Reset
R/W
—
4
0
Low-Voltage
Detection
Reset
—
—
—
VREFSEL
R/W
3
0
Low-Voltage
Detection
Voltage Drop
Interrupt
—
—
R/W
—
2
0
LVDDF
R/W
0 *
1
(initial value)
Low-Voltage
Detection
Voltage Rise
Interrupt
—
—
—
LVDUF
R/W
0 *
0