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HD64F36022 Datasheet(PDF) 258 Page - Renesas Technology Corp

Part # HD64F36022
Description  Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
PDF  384 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD64F36022 Datasheet(HTML) 258 Page - Renesas Technology Corp

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Section 15 Power-On Reset and Low-Voltage Detection Circuits (Optional)
Rev. 4.00 Sep. 23, 2005 Page 232 of 354
REJ09B0025-0400
Table 15.1
LVDCR Settings and Select Functions
LVDCR Settings
Select Functions
LVDE
LVDSEL
LVDRE
LVDDE
LVDUE
Power-On
Reset
LVDR
Low-Voltage-
Detection
Falling
Interrupt
Low-Voltage-
Detection
Rising
Interrupt
0
*
*
*
*
O
1
1
1
0
0
O
O
1
0
0
1
0
O
O
1
0
0
1
1
O
O
O
1
0
1
1
1
O
O
O
O
Legend
* means invalid.
15.2.2
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 V)
[Clearing condition]
Writing 0 to this bit after reading it as 1
Note:
*
Initialized by LVDR.



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