HT66F019 datasheet(110/175 Pages) HOLTEK

110 / 175 page

Rev. 1.00

110

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Rev. 1.00

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HT66F019

A/D Flash MCU with EEPROM

HT66F019

A/D Flash MCU with EEPROM

FFFH

FFEH

FFDH

03H

0�H

01H

�

4093 4094 4095 4096

VREF

4096

Analog Input Voltage

A/D Conversion

Result

1.5 LSB

0.5 LSB

Ideal A/D Transfer Function

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,0Fh ;setupACERLtoconfigurepinsAN0~AN3

mov ACERL,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/Dconversion

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/Dconversion

HT66F019 Datasheet(PDF) 110 Page - Holtek Semiconductor Inc

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