Datasheet

Section 26 Low-Voltage Detection Circuits
Page 860 of 982 REJ09B0465-0300 Rev. 3.00
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
26.2.2 Low-Voltage Detection Circuit 2 Control Register H (LD2CRH)
Address:
Bit:
Value after reset:
b7
VD2DF
0
b6
VD2UF
0
b5
0
b4
0
b3
VD2DFS
0
b2
VD2IRCS
0
b1
VD2MS
0
b0
VD2RE
0
H'FF0622
VD2DFCK[1:0]
Bit Symbol Bit Name Description R/W
7 VD2DF LVD2
power
supply
voltage
drop flag
[Setting condition]
• When the power-supply voltage falls below Vdet2.
[Clearing conditions]
• When 1 is read from this bit and then 0 is written to
this bit.
• When the LVD2 circuit is in standby mode.
R/W
6 VD2UF LVD2
power
supply
voltage rise
flag
[Setting condition]
• When the power supply voltage falls below Vdet2
and rises to Vdet2 or higher before falling to Vdet0
or lower.
[Clearing conditions]
• When 1 is read from this bit and then 0 is written to
this bit.
• When the LVD2 circuit is in standby mode.
R/W
5, 4 VD2DFCK[1:0] LVD2
digital filter
sampling
clock select
00: φloco/1
01: φloco/2
10: φloco/4
11: φloco/8
R/W
3 VD2DFS LVD2
digital filter
function
select
0: Disables the digital filter function
1: Enables the digital filter function
R/W
2 VD2IRCS LVD2
interrupt
request
generation
condition
select
0: when VCC rises to Vdet2 or higher.
1: when VCC falls to Vdet2 or lower.
When VD2DFS = 1, an interrupt request is generated
when the voltage reaches Vdet2, regardless of this bit
setting.
When VD2MS = 1, a reset request is generated when
the voltage falls below Vdet2, regardless of this bit
setting.
R/W