Datasheet

Section 19 Power-On Reset and Low-Voltage Detection Circuits (Optional)

Rev. 4.00 Mar. 15, 2006 Page 407 of 556

REJ09B0026-0400

19.2.2 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

[Clearing condition]

Writing 0 to this bit after reading it as 1

Note: * Initialized by LVDR.