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Table 17.1 LVDCR Settings and Select Functions
LVDE BGRE VDDII LVDSEL LVDRE LVDDE LVDUE
1
0
*
1
1
1
1
1
1
1
1
Notes: 1. Set these bits if necessary.
2. Settings are ignored.
17.2.2
Low-Voltage-Detection Status Register (LVDSR)
LVDSR indicates whether the power-supply voltage falls below or rises above the respective
given values.
Bit
Bit Name
7 to 2
1
LVDDF
0
LVDUF
Note:
* Initialized by an LVDR.
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LVDCR Settings
2
2
2
*
*
*
1
1
1
*
1
*
0
0
1
*
0
0
1
*
0
1
Initial
Value
R/W
All 1
0*
R/W
0*
R/W
Power-On
Reset
2
2
√
*
*
0
0
√
√
1
0
√
1
1
√
1
1
Description
Reserved
These bits are always read as 1 and cannot be modified.
LVD Power-Supply Voltage Fall Flag
[Setting condition]
When the power-supply voltage falls below Vint (D)
(Typ. = 3.7 V)
[Clearing condition]
When writing 0 to this bit after reading it as 1
LVD Power-Supply Voltage Rise Flag
[Setting condition]
When the power supply voltage falls below Vint (D) while
the LVDUE bit in LVDCR is set to 1 and then rises above
Vint (U) (Typ. = 4.0 V) before falling below Vreset1 (Typ.
= 2.3 V)
[Clearing condition]
When writing 0 to this bit after reading it as 1
Select Functions
Low-
Voltage-
Detection
Fall
LVDR
Interrupt
√
√
√
√
√
Rev. 1.00, 11/03, page 271 of 376
Low-
Voltage-
Detection
Rise
Interrupt
√
√
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