Datasheet

Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
Rev. 3.00 Sep. 14, 2006 Page 290 of 408
REJ09B0105-0300
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
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]
• When 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 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
Note: * Initialized by an LVDR.