SN8P1602A datasheet(59/76 Pages) SONIX

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SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 59

Version 1.1

MULTI-INTERRUPT OPERATION

Under certain condition, the software designer uses more than one interrupt requests. Processing multi-interrupt

request requires setting the priority of the interrupt requests. The IRQ flags of interrupts are controlled by the interrupt

event. Nevertheless, the IRQ flag “1” doesn’t mean the system will execute the interrupt vector. And which means the

IRQ flags can be set “1” by the events without enable the interrupt.

Once the event occurs, the IRQ will be logic “1”.

The IRQ and its trigger event relationship is as the below table.

Interrupt Name

Trigger Event Description

P00IRQ

P0.0 trigger controlled by PEDGE

TC0IRQ

TC0C overflow

For multi-interrupt conditions, two things need to be taking care of. One is to set the priority for these interrupt requests.

Two is using IEN and IRQ flags to decide which interrupt to be executed. Users have to check interrupt control bit and

interrupt request flag in interrupt routine.

Example: Check the interrupt request under multi-interrupt operation

ORG

; Interrupt vector

B0XCH

A, ACCBUF

; Store ACC value.

B0MOV

A, PFLAG

; Store PFLAG value

B0MOV

PFLAGBUF,A

INTP00CHK:

; Check INT0 interrupt request

B0BTS1

FP00IEN

; Check P00IEN

JMP

INTTC0CHK

; Jump check to next interrupt

B0BTS0

FP00IRQ

; Check P00IRQ

JMP

INTP00

; Jump to INT0 interrupt service routine

INTTC0CHK:

; Check TC0 interrupt request

B0BTS1

FTC0IEN

; Check TC0IEN

JMP

INT_EXIT

; Jump to exit of IRQ

B0BTS0

FTC0IRQ

; Check TC0IRQ

JMP

INTTC0

; Jump to TC0 interrupt service routine

INT_EXIT:

B0MOV

A, PFLAGBUF

; Restore PFLAG value

B0MOV

PFLAG,A

B0XCH

A, ACCBUF

; Restore ACC value.

RETI

; Exit interrupt vector

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