UPD17708 datasheet(216/358 Pages) RENESAS

216 / 358 page

214

µPD17704, 17705, 17707, 17708, 17709

15.7 Example of Using D/A Converter

An example of a program using the D/A converter is shown below.

Example This program increments the duty factor of the PWM1 pin every 1 second.

PWM1DATA DAT

0000H

INITIAL:

INITFLG

NOT PWM2SEL, NOT PWM1SEL, NOT PWM0SEL

;

(General-purpose port), (General-purpose port), (General-purpose port)

INITFLG

PWMBIT

, NOT PWMCK

;

(9-bit counter), (1.125 MHz)

LOOP0:

BANK1

CLR1

P1B1

BANK0

CLR1

TM3SEL

; Selects D/A converter

MOV

DBF2, #PWM1DATA SHR 8 AND 0FH

MOV

DBF1, #PWM1DATA SHR 4 AND 0FH

MOV

DBF0, #PWM1DATA AND 0FH

SET1

PWM1SEL

; Sets PWM1/P1B1 pin in PWM output port mode

LOOP1:

; Duty: 0.25/512 to 511.25/512 (PWM output)

PUT

PWM1R, DBF

GET2

TM3RES, TM3EN

; Resets and starts counter

Waits for 1 second

GET

DBF, PWM1R

ADD

DBF0, #1

ADDC

DBF1, #0

ADDC

DBF2, #1

SKGE

DBF2, #2

LOOP1

LOOP2:

; Port outputs high level

BANK1

SET1

P1B1

BANK0

CLR1

PWM1SEL

; Sets PWM1/P1B1 pin in general-purpose output port mode

Waits for 1 second

LOOP0

UPD17708 Datasheet(PDF) 216 Page - Renesas Technology Corp

UPD17708 Datasheet(HTML) 216 Page - Renesas Technology Corp

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