HT46R0664 datasheet(32/92 Pages) HOLTEK

32 / 92 page

Rev. 1.00

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HT46R0664

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

Counter and Stack Pointer, the other flags remain in their original status.

Pins PA0 to PA7 can be setup via the PAWK register to permit a negative transition on the pin to

wake-up the system. When a PA0 to PA7 pin wake-up occurs, the program will resume execution at

the instruction following the “HALT” instruction.

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 wake-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 to “1” before entering the Idle/Sleep

Mode, then any future interrupt requests will not generate a wake-up function of the related interrupt

will be ignored.

No matter what the source of the wake-up event is, once a wake-up event occurs, there will be a

time delay before normal program execution resumes. Consult the table for the related time.

Wake-up Source

Oscillator Type

ERC, IRC

Crystal

CLKMOD=1

LXTEN=0

CLKMOD=1

LXTEN=1

Power On Reset/LVR

tRSDT+tSST1

tRSDT+tSST�

—

P� port

tSST1

tSST�

tSST1

Interr�pt

WDT Overflow

Wake-up Delay Time

Note: 1. tRSTD (reset delay time), tSYS (system clock)

2. tRSTD is power-on delay, typical time=50ms

3. tSST1=2tSYS

4. tSST2=128tSYS

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