UPD17708 datasheet(186/358 Pages) RENESAS

186 / 358 page

µPD17704, 17705, 17707, 17708, 17709

184

13.5.4 Example of using timer 2

(1) Modulo timer

The modulo timer is used for time management by generating a timer 2 interrupt at fixed intervals.

An example of a program is shown below.

This program executes processing B every 500

µs.

TM2DATA

DAT

0032H

; Count data = 50

START:

INITIAL

; Reset address

; Interrupt vector address

NOP

; SIO1

NOP

; SIO0

NOP

; TM3

INT_TM2

; TM2

NOP

; TM1

NOP

; TM0

NOP

; INT4

NOP

; INT3

NOP

; INT2

NOP

; INT1

NOP

; INT0

NOP

; Down edge of CE

INITIAL:

INITFLG

NOT TM2EN, TM2RES, NOT TM2CK1, NOT TM2CK0

;

(Stop)

, (Reset) ,

(Basic clock = 10

µs)

MOV

DBF0, #TM2DATA

MOV

DBF1, #TM2DATA SHR4 AND 0FH

PUT

TM2, DBF

SET1

TM2EN

; START

SET1

IPTM2

; Enables timer 2 interrupt

LOOP:

Processing A

LOOP

INT_TM2:

PUT

DBFSTK, DBF

; Saves data buffer

INITFLG

TM2EN, TM2RES

; Resets and starts

Processing B

GET

DBF, DBFSTK

RETI

; Return

END

UPD17708 Datasheet(PDF) 186 Page - Renesas Technology Corp

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