HT46R0664 datasheet(37/92 Pages) HOLTEK

37 / 92 page

Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

have the value of 01010101B. Note that the LVR function will be automatically disabled when the

device enters power down mode.

LV R

In te r nal R es et

t RS TD + t SST

Low Voltage Reset Timing Chart

LVRC Register

Bit

Name

LVS7

LVS6

LVS5

LVS4

LVS3

LVS�

LVS1

LVS0

R/W

POR

Bit 7~0

LVS7~LVS0: LVR Voltage Select control

01010101: 2.1V

00110011: 2.55V

10011001: 3.15V

10101010: 3.8V

Any other value: Generates MCU reset – register is reset to POR value

When an actual low voltage condition occurs, as specified by one of the four defined

LVR voltage values above, an MCU reset will be generated. The reset operation will

be activated after 2~3 LIRC clock cycles. In this situation the register contents will

remain the same after such a reset occurs.

Any register value, other than the four defined LVR values above, will also result in

the generation of an MCU reset. The reset operation will be activated after 2~3 LIRC

clock cycles. However in this situation the register contents will be reset to the POR

value.

CTRL3 Register

Bit

Name

—

LVRF

LRF

WRF

R/W

—

R/W

POR

—

Bit 7~3

“—”: Unimplemented, read as 0

Bit 2

LVRF: LVR function reset flag

0: Not occur

1: Occurred

This bit is set to 1 when a specific Low Voltage Reset situation condition occurs. This

bit can only be cleared to 0 by the application program.

Bit 1

LRF: LVR Control register software reset flag

0: Not occur

1: Occurred

This bit is set to 1 if the LVRC register contains any non defined LVR voltage register

values. This in effect acts like a software reset function. This bit can only be cleared to

0 by the application program.

Bit 0

WRF: WDT Control register software reset flag

Describe elsewhere.

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