HD64F36024FX Datasheet, PDF (259/386 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 15 Power-On Reset and Low-Voltage Detection Circuits (Optional)
15.2.1 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 15.1 shows the relationship between the LVDCR settings and select functions. LVDCR
should be set according to table 15.1.
Initial
Bit
Bit Name Value R/W Description
7
LVDE
0*
R/W LVD Enable
0: The low-voltage detection circuit is not used (In
standby mode)
1: The low-voltage detection circuit is used
6 to 4 
All 1

Reserved
These bits are always read as 1, and cannot be modified.
3
LVDSEL 0*
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.
2
LVDRE 0*
R/W LVDR Enable
0: Disables the LVDR function
1: Enables the LVDR function
1
LVDDE 0
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
0
LVDUE 0
R/W Voltage-Rise-Interrupt Enable
0: Interrupt on the power-supply voltage rising above the
selected detection level disabled
1: Interrupt on the power-supply voltage rising above the
selected detection level enabled
Note: * Not initialized by LVDR but initialized by a power-on reset or WDT reset.
Rev. 4.00 Sep. 23, 2005 Page 231 of 354
REJ09B0025-0400