SN8P1602AX datasheet(55/94 Pages) SONIX

55 / 94 page

SN8P1600

8-bit micro-controller

SONiX TECHNOLOGY CO., LTD

Page 55

Revision 1.94

TC0 TIMER OPERATION SEQUENCE

The TC0 timer’s sequence of operation may be as following.

Set the TC0C initial value to setup the interval time.

Set the TC0ENB to be “1” to enable TC0 timer.

TC0C is incremented by one after each clock pulse corresponding to TC0M selection.

TC0C overflow if TC0C from FFH to 00H.

When TC0C overflow occur, the TC0IRQ flag is set to be “1” by hardware.

Execute the interrupt service routine.

Users reset the TC0C value and resume the TC0 timer operation.

Example: Setup the TC0M and TC0C.

B0BCLR

FTC0IEN

; To disable TC0 interrupt service

B0BCLR

FTC0ENB

; To disable TC0 timer

MOV

A,#20H

;

B0MOV

TC0M,A

; To set TC0 clock = fcpu / 64

MOV

A,#74H

; To set TC0C initial value = 74H

B0MOV

TC0C,A

;(To set TC0 interval = 10 ms)

B0BSET

FTC0IEN

; To enable TC0 interrupt service

B0BCLR

FTC0IRQ

; To clear TC0 interrupt request

B0BSET

FTC0ENB

; To enable TC0 timer

Example: TC0 interrupt service routine.

ORG

; Interrupt vector

JMP

INT_SERVICE

INT_SERVICE:

B0XCH

A, ACCBUF

; B0xch instruction do not change C,Z flag

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

; Reload TC0C

B0MOV

TC0C,A

; TC0 interrupt service routine

JMP

EXIT_INT

; End of TC0 interrupt service routine and exit interrupt

vector

EXIT_INT:

B0MOV

A, PFLAGBUF

B0MOV

PFLAG, A

B0XCH

A, ACCBUF

; Restore ACC value.

RETI

; Exit interrupt vector

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