HT66F005 datasheet(79/109 Pages) HOLTEK

79 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with 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 Examples

ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion.

Inthefirstexample,themethodofpollingtheEOCBbitintheADCR0registerisusedtodetect

whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto

determinewhentheconversioniscomplete.

Example 1: using an EOCB polling method to detect the end of conversion

clr ADE

; disable ADC interrupt

mov a,03H

mov ADCR1,a ;selectfSYS/8asA/Dclockandswitchoff1.25V

clr ADOFF

mov a,0Fh ;setupACERtoconfigurepinsAN0~AN3

mov ACER,a

mov a,00h

mov ADCR0,a ;enableandconnectAN0channeltoA/Dconverter

start_conversion:

clrSTART ;highpulseonstartbittoinitiateconversion

setSTART;resetA/D

clrSTART ;startA/D

polling_EOC:

szEOCB ;polltheADCR0registerEOCBbittodetectend

;ofA/Dconversion

jmppolling_EOC ;continuepolling

mova,ADRL;readlowbyteconversionresultvalue

movADRL_buffer,a;saveresulttouserdefinedregister

mova,ADRH;readhighbyteconversionresultvalue

movADRH_buffer,a;saveresulttouserdefinedregister

jmp start_conversion;startnexta/dconversion

HT66F005 Datasheet(PDF) 79 Page - Holtek Semiconductor Inc

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