Register Descriptions; Low-Voltage-Detection Control Register (Lvdcr) - Renesas H8 Series Hardware Manual

Section 17 Band-Gap Circuit, Power-On Reset, and Low-Voltage Detection Circuits
17.2

Register Descriptions

The low-voltage detection circuit has the following registers.

• Low-voltage-detection control register (LVDCR)

• Low-voltage-detection status register (LVDSR)
17.2.1 Low-Voltage-Detection Control Register (LVDCR)
LVDCR enables or disables the low-voltage detection circuit and BGR circuit, selects the
compared voltage of the LVDI circuit, sets the detection levels for the LVDR circuit, enables or
disables the LVDR circuit, and enables or disables generation of an interrupt when the power-
supply voltage rises above or falls below the respective levels.
Table 17.1 shows the relationship between the LVDCR settings and functions to be selected.
LVDCR should be set according to table 17.1.
Bit Bit Name
7 LVDE
6 BGRE
5 VDDII

4
Rev. 3.00 Sep. 14, 2006 Page 288 of 408
REJ09B0105-0300
Initial
Value R/W Description
1* R/W LVD Enable
0: Low-voltage detection circuit is not used (standby
1: Low-voltage detection circuit is used
1* R/W BGR Enable
0: BGR circuit is not used (standby mode)
1: BGR circuit is used
1* R/W LVDR External Compared Voltage Input Inhibit
0: Use external voltage as LVDI compared voltage
1: Use internal voltage as LVDI compared voltage

1 Reserved
This bit is always read as 1 and cannot be modified.
mode)