Datasheet

Section 26 Low-Voltage Detection Circuits
REJ09B0465-0300 Rev. 3.00 Page 863 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
26.2.4 Low-Voltage Detection Circuit 1 Control Register H (LD1CRH)
Address:
Bit:
Value after reset:
b7
VD1DF
0
b6
VD1UF
0
b5
0
b4
0
b3
VD1DFS
0
b2
VD1IRCS
0
b1
VD1MS
0
b0
VD1RE
0
H'FF0624
VD1DFCK[1:0]
Bit Symbol Bit Name Description R/W
7 VD1DF LVD1 power
supply
voltage drop
flag
[Setting condition]
• When the power-supply voltage falls below Vdet1.
[Clearing conditions]
• When 1 is read from this bit and then 0 is written to.
• When the LVD1 circuit is in standby mode.
R/W
6 VD1UF LVD1 power
supply
voltage rise
flag
[Setting condition]
• When the power supply voltage falls below Vdet1 and
rises to Vdet1 or higher before falling to Vdet0 or lower
[Clearing conditions]
• When 1 is read from this bit and then 0 is written to.
• When the LVD1 circuit is in standby mode.
R/W
5, 4 VD1DFCK
[1:0]
LVD1 digital
filter
sampling
clock select
00: φloco/1
01: φloco/2
10: φloco/4
11: φloco/8
R/W
3 VD1DFS LVD1 digital
filter
function
select
0: Disables the digital filter function
1: Enables the digital filter function
R/W
2 VD1IRCS LVD1
interrupt
request
generation
condition
select
0: Generates an interrupt request when VCC rises to Vdet1
or more.
1: Generates an interrupt request when VCC falls to Vdet1
or less.
When VD1DFS = 1, an interrupt request is generated when
the voltage reaches Vdet1, regardless of this bit setting.
When VD1MS = 1, a reset request is generated when the
voltage falls below Vdet1, regardless of this bit setting.
R/W