HT66F4530 datasheet(130/224 Pages) HOLTEK

130 / 224 page

Rev. 1.00

130

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Rev. 1.00

131

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

A/D Conversion Programming Examples

ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion.

Inthefirstexample,themethodofpollingtheADBZbitintheSADC0registerisusedtodetect

whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto

determinewhentheconversioniscomplete.

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

clr ADE

; disable ADC interrupt

mov a,03H

mov SADC1,a;selectfSYS/8asA/Dclock

set ADCEN

mov a,10h;setupPAS1registertoconfigurepinAN0

mov PAS1,a

mov a,20h

mov SADC0,a;enableandconnectAN0channeltoA/Dconverter

start_conversion:

clr START;highpulseonstartbittoinitiateconversion

set START;resetA/D

clr START ;startA/D

polling_EOC:

sz ADBZ ;polltheSADC0registerADBZbittodetectendofA/D

conversion

jmp polling_EOC ;continuepolling

mov a,SADOL;readlowbyteconversionresultvalue

mov SADOL_buffer,a;saveresulttouserdefinedregister

mov a,SADOH;readhighbyteconversionresultvalue

mov SADOH_buffer,a;saveresulttouserdefinedregister

jmp start_conversion;startnextA/D conversion

HT66F4530 Datasheet(PDF) 130 Page - Holtek Semiconductor Inc