HT66F20 datasheet(181/298 Pages) HOLTEK

181 / 298 page

Rev. 1.90

180

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Rev. 1.90

181

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

Example: using the interrupt method to detect the end of conversion

clr ADE

; disable ADC interrupt

mov a,03H

movADCR1,a ;selectfSYS/8asA/Dclockandswitchoff1.25V

ClrADOFF

mova,0Fh;setupACERLandACERHtoconfigurepinsAN0~AN3

movACERL,a

mov a,00h

movACERH,00h ;ACERHisonlyforHT66F60

mov a,00h

movADCR0,a ;enableandconnectAN0channeltoA/Dconverter

Start_conversion:

clrSTART;highpulseonSTARTbittoinitiateconversion

setSTART;resetA/D

clrSTART;startA/D

clrADF;clearADCinterruptrequestflag

set ADE

; enable ADC interrupt

setEMI;enableglobalinterrupt

; ADC interrupt service routine

ADC_ISR:

movacc_stack,a;saveACCtouserdefinedmemory

mova,STATUS

movstatus_stack,a ;saveSTATUStouserdefinedmemory

mova,ADRL ;readlowbyteconversionresultvalue

movadrl_buffer,a ;saveresulttouserdefinedregister

mova,ADRH ;readhighbyteconversionresultvalue

movadrh_buffer,a ;saveresulttouserdefinedregister

EXIT_INT_ISR:

mova,status_stack

movSTATUS,a ;restoreSTATUSfromuserdefinedmemory

mova,acc_stack;restoreACCfromuserdefinedmemory

reti

HT66F20 Datasheet(PDF) 181 Page - Holtek Semiconductor Inc

HT66F20 Datasheet(HTML) 181 Page - Holtek Semiconductor Inc

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