HD64F36022 datasheet(257/384 Pages) RENESAS

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Section 15 Power-On Reset and Low-Voltage Detection Circuits (Optional)

Rev. 4.00 Sep. 23, 2005 Page 231 of 354

REJ09B0025-0400

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.

Bit

Bit Name

Initial

Value

R/W

Description

LVDE

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.

LVDSEL

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.

LVDRE

R/W

LVDR Enable

0: Disables the LVDR function

1: Enables the LVDR function

LVDDE

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

LVDUE

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.

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