HT67F488 datasheet(101/171 Pages) HOLTEK

101 / 171 page

Rev. 1.60

101

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

FF EH

(

)

A/ D Co nv er si on

Re su lt

FFFH

FF DH

03 H

02 H

01 H

0. 5 LS B

409 3 409 44 09 54 09 6

An al og I npu t V ol t age

1. 5 LS B

V DD or V RE F

409 6

Ideal A/D Transfer Function

A/D Programming Example

ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion.

Inthefirstexample,themethodofpollingtheEOCBbitintheADCR0registerisusedtodetect

whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto

determinewhentheconversioniscomplete.

Example: using an EOCB polling method to detect the end of conversion

clr ADE

; disable ADC interrupt

mov a, 03H

mov ADCR1,a;selectfSYS/8asA/DclockandswitchoffVBG

clr ADOFF

mov a,0Fh;setupACERLtoconfigurepinsAN0~AN3

mov ACERL,a

mov a,00h

mov ACERH,a

mov a, 00h

mov ADCR0,a;enableandconnectAN0channeltoA/Dconverter

Start_conversion:

clr START

set START ;resetA/D

clr START;startA/D

Polling_EOC:

sz EOCB ;polltheADCR0registerEOCBbittodetectend

;ofA/Dconversion

jmp polling_EOC ;continuepolling

mov a,ADRL;readlowbyteconversionresultvalue

mov adrl_buffer,a;saveresulttouserdefinedregister

mov a,ADRH;readhighbyteconversionresultvalue

mov adrh_buffer,a;saveresulttouserdefinedregister

jmp start_conversion;startnextA/Dconversion

HT67F488 Datasheet(PDF) 101 Page - Holtek Semiconductor Inc

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