SN8P1602A datasheet(58/76 Pages) SONIX

58 / 76 page

SN8P1602B

8-Bit Micro-Controller

SONiX TECHNOLOGY CO., LTD

Page 58

Version 1.1

TC0 INTERRUPT OPERATION

Example: TC0 interrupt request setup.

B0BCLR

FTC0IEN

; Disable TC0 interrupt service

B0BCLR

FTC0ENB

; Disable TC0 timer

MOV

A, #20H

;

B0MOV

TC0M, A

; Set TC0 clock = Fcpu / 64

MOV

A, #74H

; Set TC0C initial value = 74H

B0MOV

TC0C, A

; Set TC0 interval = 10 ms

B0BSET

FTC0IEN

; Enable TC0 interrupt service

B0BCLR

FTC0IRQ

; Clear TC0 interrupt request flag

B0BSET

FTC0ENB

; Enable TC0 timer

B0BSET

FGIE

; Enable GIE

Example: TC0 interrupt service routine.

ORG

; Interrupt vector

JMP

INT_SERVICE

INT_SERVICE:

B0XCH

A, ACCBUF

; Store ACC value.

B0MOV

A, PFLAG

B0MOV

PFLAGBUF, A

B0BTS1

FTC0IRQ

; Check TC0IRQ

JMP

EXIT_INT

; TC0IRQ = 0, exit interrupt vector

B0BCLR

FTC0IRQ

; Reset TC0IRQ

MOV

A, #74H

B0MOV

TC0C, A

; Reset TC0C.

; TC0 interrupt service routine

EXIT_INT:

B0MOV

A, PFLAGBUF

B0MOV

PFLAG, A

B0XCH

A, ACCBUF

; Restore ACC value.

RETI

; Exit interrupt vector

When the TC0C counter overflows, the TC0IRQ will be set to “1” no matter the TC0IEN is enable or disable. If the

TC0IEN and the trigger event TC0IRQ is set to be “1”.

As the result, the system will execute the interrupt vector. If the

TC0IEN = 0, the trigger event TC0IRQ is still set to be “1”.

Moreover, the system won’t execute interrupt vector even

when the TC0IEN is set to be “1”. Users need to be cautious with the operation under multi-interrupt situation.

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