Low-Voltage-Detection Status Register (Lvdsr); Table 17.1 Lvdcr Settings And Select Functions - Renesas H8 Series Hardware Manual

Table 17.1 LVDCR Settings and Select Functions

LVDCR Settings
VDDII LVDSEL
* 1
* 0
* 0
Note: Set these bits if necessary.
*
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.
Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
LVDDE LVDUE
0 0
1 0
1 1
Initial
Value R/W Description

All 1 Reserved
These bits are always read as 1 and cannot be modified.
0* R/W LVD Power-Supply Voltage Fall Flag
[Setting condition]
•
[Clearing condition]
•
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
Select Functions
Power-On
Reset LVDR
√ √
√ √
√ √
When the power-supply voltage falls below Vint (D)
(Typ. = 3.7 V)
When writing 0 to this bit after reading it as 1
Rev. 1.00 Aug. 28, 2006 Page 293 of 400
Low-Voltage- Low-Voltage-
Detection Fall Detection Rise
Interrupt Interrupt
 
√ 
√ √
REJ09B0268-0100