H836109 Datasheet, PDF (496/622 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Tiny Series

Section 20 Band-Gap Regulator, Power-On Reset (Optional), and Low-Voltage Detection Circuits (Optional)
20.2 Register Descriptions
The low-voltage detection circuit has the following registers.
• Low-voltage-detection control register (LVDCR)
• Low-voltage-detection status register (LVDSR)
20.2.1 Low-Voltage-Detection Control Register (LVDCR)
LVDCR is used to enable or disable the low-voltage detection circuit, set the detection levels for
the LVDR function, enable or disable the LVDR function, and enable or disable generation of an
interrupt when the power-supply voltage rises above or falls below the respective levels.
Table 20.1 shows the relationship between the LVDCR settings and select functions. LVDCR
should be set according to table 20.1.
Bit
7 to 4
Bit Name

Initial
Value
All 1
3
LVDSEL 1
2

1
1
LVDDE 0
R/W Description

Reserved
These bits are always read as 1. Data write is inhibited.
R/W LVDR Detection Level Select
0: Reset detection voltage is 2.3 V (typ.)
1: Reset detection voltage is 3.6 V (typ.)
When the falling or rising voltage detection interrupt is
used, reset detection voltage of 2.3 V (typ.) should be
used. When only a reset detection interrupt is used,
reset detection voltage of 3.6 V (typ.) should be used.
This bit is initialized by a LVDR reset.

Reserved
This bit is always read as 1. Data write is inhibited.
R/W Voltage-Fall-Interrupt Enable
0: Interrupt on the power-supply voltage falling below
the selected detection level disabled
1: Interrupt on the power-supply voltage falling below
the selected detection level enabled
Rev. 1.50 Sep. 18, 2007 Page 462 of 584
REJ09B0240-0150