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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F4M датащи(PDF) 95 Page - Holtek Semiconductor Inc |
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HT45F4M датащи(HTML) 95 Page - Holtek Semiconductor Inc |
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95 / 138 page  Rev. 1.10 94 �an�a�� 1�� �01� Rev. 1.10 9� �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU A/D Programming Example ThefollowingtwoprogrammingexamplesillustratehowtosetupandimplementanA/Dconversion. Inthefirstexample,themethodofpollingtheEOCBbitintheADCR0registerisusedtodetect whentheconversioncycleiscomplete,whereasinthesecondexample,theA/Dinterruptisusedto determinewhentheconversioniscomplete. • Example:usinganEOCBpollingmethodtodetecttheendofconversion clr ADE ; disable ADC interrupt mov a,03H mov ADCR1,a ; select fSYS/8 as A/D clock and switch off 1.25V clr ADOFF mov a,0Fh ; setup ACERL to configure pins AN0~AN3 mov ACERL,a mov a,01h mov ADCR0,a ; enable and connect AN0 channel to A/D converter : start_conversion: clr START ; high pulse on start bit to initiate conversion set START ; reset A/D clr START ; start A/D polling_EOC: sz EOCB ; poll the ADCR0 register EOCB bit to detect end of A/D conversion jmp polling_EOC ; continue polling mov a,ADRL ; read low byte conversion result value mov ADRL_buffer,a ; save result to user defined register mov a,ADRH ; read high byte conversion result value mov ADRH_buffer,a ; save result to user defined register : : jmp start_conversion ; start next a/d conversion |
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