HT67F60 datasheet(204/242 Pages) HOLTEK

204 / 242 page

Rev. 1.50

204

March 06 , 2012

Rev. 1.50

205

March 06 , 2012

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPRO

If the system is woken up by an interrupt, then two possible situations may occur. The first is where

the related interrupt is disabled or the interrupt is enabled but the stack is full, in which case the

program will resume execution at the instruction following the "HALT instruction. In this situation,

the interrupt which woke-up the device will not be immediately serviced, but will rather be serviced

later when the related interrupt is finally enabled or when a stack level becomes free. The other

situation is where the related interrupt is enabled and the stack is not full, in which case the regular

interrupt response takes place. If an interrupt request flag is set high before entering the SLEEP or

IDLE Mode, the wake-up function of the related interrupt will be disabled.

Low Voltage Detector – LVD

Each 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

—

VLVD2

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

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: 4.4V

HT67F60 Datasheet(PDF) 204 Page - Holtek Semiconductor Inc

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