HT46R0664 datasheet(76/92 Pages) HOLTEK

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD Type 8-Bit OTP MCU

Low Voltage Detector – LVD

The device has a Low Voltage Detector function, also known as LVD. This enabled the device to

monitor the power supply voltage, VDD, and provide a warning signal should it fall below a certain

level. This function may be especially useful in battery applications where the supply voltage will

gradually reduce as the battery ages, as it allows an early warning battery low signal to be generated.

The Low Voltage Detector also has the capability of generating an interrupt signal.

LVD Register

The Low Voltage Detector function is controlled using a single register with the name LVDC. Three

bits in this register, VLVD2~VLVD0, are used to select one of eight fixed voltages below which a low

voltage condition will be detemined. A low voltage condition is indicated when the LVDO bit is set.

If the LVDO bit is low, this indicates that the VDD voltage is above the preset low voltage value. The

LVDEN bit is used to control the overall on/off function of the low voltage detector. Setting the bit

high will enable the low voltage detector. Clearing the bit to zero will switch off the internal low

voltage detector circuits. As the low voltage detector will consume a certain amount of power, it may

be desirable to switch off the circuit when not in use, an important consideration in power sensitive

battery powered applications.

LVDC Register

Bit

Name

—

LVDO

LVDEN

—

VLVD�

VLVD1

VLVD0

R/W

—

R/W

—

R/W

POR

—

Bit 7~6

Unimplemented, read as "0"

Bit 5

LVDO: LVD Output Flag

0: no Low Voltage Detect

1: low Voltage Detect

Bit 4

LVDEN: Low Voltage Detector Control

0: disable

1: enable

Bit 3

Unimplemented, read as “0”

Bit 2~0

VLVD2~VLVD0: Select LVD Voltage

000: 2.0V

001: 2.2V

010: 2.4V

011: 2.7V

100: 3.0V

101: 3.3V

110: 3.6V

111: 4.0V

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