Rev. 6.00, 08/04, page 428 of 628
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
LVDCR Setting Value
LVDE
LVDSEL
LVDRE
LVDDE LVDUE
Power-on
Reset
Low-Voltage
Detection
Reset
Low-Voltage
Detection
Voltage Drop
Interrupt
Low-Voltage
Detection
Voltage Rise
Interrupt
0
*
*
*
*
—
—
—
1
1
1
0
0
—
—
1
0
0
1
0
—
—
1
0
0
1
1
—
1
0
1
1
1
Note:
Setting values marked with an asterisk (
*
) are invalid.
14.2.2
Low-Voltage Detection Status Register (LVDSR)
Bit
7
6
5
4
3
2
1
0
OVF
—
—
—
VREFSEL
—
LVDDF
LVDUF
Initial value
0
*
0
0
0
0
0
0
*
0
*
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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
Description
0
[Clearing condition]
(initial value)
When 0 is written after reading 1
1
[Setting condition]
When the low-voltage detection counter (LVDCNT) overflows
Summary of Contents for H8/38024 Series
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