HT46R0664 datasheet(71/92 Pages) HOLTEK

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Rev. 1.00

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Rev. 1.00

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HT46R0664

Enhanced A/D+LCD 8-Bit OTP MCU

CTRL4 Register

Bit

Name

—

LXTLP

—

TB1�

TB11

TB10

R/W

—

R/W

—

R/W

POR

—

Bit 7~3

Described elsewhere

Bit 2~0

TB12~TB10: Time Base 1 clock selection

000: fS/28

001: fS/29

010: fS/210

011: fS/211

100: fS/212

101: fS/213

110: fS/214

111: fS/215

LI RC

f SY S /4

¸ 2 ~ 2

TB 12 ~T B1 0

Ti me B as e 0 In te rr upt

Ti me B as e 1 In te rr upt

TB 01 ~T B0 0

f S

f S S ou rc e

Co nf ig ur at io n

O pt io n

LX T

Time Base Interrupts

Interrupt Wake-up Function

Each of the interrupt functions has the capability of waking up the microcontroller when in the

SLEEP or IDLE Mode. A wake-up is generated when an interrupt request flag changes from low to

high and is independent of whether the interrupt is enabled or not. Therefore, even though the device

is in the SLEEP or IDLE Mode and its system oscillator stopped, situations such as external edge

transitions on the external interrupt pins, a low power supply voltage or may cause their respective

interrupt flag to be set high and consequently generate an interrupt. Care must therefore be taken if

spurious wake-up situations are to be avoided. If an interrupt wake-up function is to be disabled then

the corresponding interrupt request flag should be set high before the device enters the SLEEP or

IDLE Mode. The interrupt enable bits have no effect on the interrupt wake-up function.

Programming Considerations

By disabling the relevant interrupt enable bits, a requested interrupt can be prevented from being

serviced, however, once an interrupt request flag is set, it will remain in this condition in the

interrupt register until the corresponding interrupt is serviced or until the request flag is cleared by a

software instruction.

Where a certain interrupt is contained within a Multi-function interrupt, then when the interrupt

service routine is executed, as only the Multi-function interrupt request flag, MFF, will be

automatically cleared, the individual request flag for the function needs to be cleared by the

application program.

It is recommended that programs do not use the “CALL” instruction within the interrupt service

subroutine. Interrupts often occur in an unpredictable manner or need to be serviced immediately.

If only one stack is left and the interrupt is not well controlled, the original control sequence will be

damaged once a CALL subroutine is executed in the interrupt subroutine. Every interrupt has the

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