UPD17708 datasheet(171/358 Pages) RENESAS

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169

µPD17704, 17705, 17707, 17708, 17709

13.3.4 Example of using timer 0

(1) Modulo counter mode

The modulo counter mode is used for time management by generating timer 0 interrupt at fixed intervals.

An example of a program is shown below.

This program executes processing B every 500

µs.

TM0DATA

DAT

0032H

; MODULO DATA = 50

START:

INITIAL

; Reset address

; Interrupt vector address

NOP

; SIO1

NOP

; SIO0

NOP

; TM3

NOP

; TM2

NOP

; TM1

INT_TM0

; TM0

NOP

; INT4

NOP

; INT3

NOP

; INT2

NOP

; INT1

NOP

; INT0

NOP

; Down edge of CE

INITIAL:

INITFLG

NOT TM0EN, TM0RES, NOT TM0CK1, NOT TM0CK0

;

(Stop)

, (Reset) ,

(Basic clock = 10

µs)

CLR1

TM0MD

; Modulo mode

MOV

DBF0, #(TM0MDATA SHR 0) AND 0FH

MOV

DBF1, #(TM0MDATA SHR 4) AND 0FH

PUT

TM0M, DBF

; Sets count data

SET1

IPTM0

; Enables timer 0 interrupt

SET1

TM0EN

; Starts timer 0

LOOP:

Processing A

LOOP

INT_TM0:

Processing B

; Timer 0 interrupt service

RETI

; Return

UPD17708 Datasheet(PDF) 171 Page - Renesas Technology Corp

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