Datasheet

Section 18 Power-On Reset and Low-Voltage Detection Circuits
Rev. 2.00 Sep. 23, 2005 Page 335 of 444
REJ09B0068-0200
18.2.2 Low-Voltage-Detection Status Register (LVDSR)
LVDSR indicates whether the power-supply voltage falls below or rises above the respective
specified values.
Bit Bit Name
Initial
Value R/W Description
7 to 2  All 1  Reserved
These bits are always read as 1 and cannot be
modified.
1 LVDDF 0* R/W LVD Power-Supply Voltage Fall Flag
[Setting condition]
When the power-supply voltage falls below Vint (D)
(typ. = 3.7 V)
[Clearing condition]
Writing 0 to this bit after reading it as 1
0 LVDUF 0* R/W 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, then rises
above Vint (U) (typ. = 4.0 V) before falling below
Vreset1 (typ. = 2.3 V)
[Clearing condition]
Writing 0 to this bit after reading it as 1
Note: * Initialized by LVDR.