HT48R064 datasheet(53/94 Pages) HOLTEK

53 / 94 page

HT48R063/064/065/066/0662/067

Rev. 1.30

June 11, 2010

When an interrupt request is generated it takes 2 or 3 in-

struction cycle before the program jumps to the interrupt

vector. If the device is in the Sleep or Idle Mode and is

woken up by an interrupt request then it will take 3 cy-

cles before the program jumps to the interrupt vector.

Interrupt Priority

Interrupts, occurring in the interval between the rising

edges of two consecutive T2 pulses, will be serviced on

the latter of the two T2 pulses, if the corresponding inter-

rupts are enabled. In case of simultaneous requests, the

following table shows the priority that is applied. These

can be masked by resetting the EMI bit.

HT48R063/064/065

Interrupt Source

Priority

Vector

External Interrupt

04H

Timer/Event Counter 0 Overflow

08H

Time Base Overflow

0CH

HT48R066

Interrupt Source

Priority

Vector

External Interrupt

04H

Timer/Event Counter 0 Overflow

08H

Timer/Event Counter 1 Overflow

0CH

Time Base Overflow

10H

HT48R0662

Interrupt Source

Priority

Vector

External Interrupt

04H

Timer/Event Counter 0 Overflow

08H

Timer/Event Counter 1 Overflow

0CH

¾¾

10H

Time Base Overflow

14H

HT48R067

Interrupt Source

Priority

Vector

External Interrupt

04H

Timer/Event Counter 0 Overflow

08H

Timer/Event Counter 1 Overflow

0CH

Timer/Event Counter 2 Overflow

10H

¾¾

14H

Time Base Overflow

18H

In cases where both external and internal interrupts are

enabled and where an external and internal interrupt oc-

curs simultaneously, the external interrupt will always

have priority and will therefore be serviced first. Suitable

masking of the individual interrupts using the interrupt

registers can prevent simultaneous occurrences.

Wait for 2 ~ 3 Instruction Cycles

Main

Program

ISR Entry

Enable Bit Set ?

Main

Program

RETI

(it will set EMI automatically)

Automatically Disable Interrupt

Clear EMI & Request Flag

Interrupt Request or

Interrupt Flag Set by Instruction

Interrupt Flow

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