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HT46R01B-1 Datasheet(PDF) 48 Page - Holtek Semiconductor Inc |
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HT46R01B-1 Datasheet(HTML) 48 Page - Holtek Semiconductor Inc |
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48 / 71 page  HT46R01B-1/HT46R01N-1 HT48R01B-1/HT48R01N-1 Rev.1.00 48 June 9, 2011 A/D Programming Example The following two programming examples illustrate how to setup and implement an A/D conversion. In the first exam- ple, the method of polling the EOCB bit in the ADCR register is used to detect when the conversion cycle is complete, whereas in the second example, the A/D interrupt is used to determine when the conversion is complete. Example: using an EOCB polling method to detect the end of conversion clr ADE ; disable ADC interrupt mov a,00000001B mov ACSR,a ; select fSYS/8 as A/D clock and ADONB=0 mov a,00000100B ; setup ADCR register to configure Port as A/D inputs mov ADCR,a ; and select AN0 to be connected to the A/D converter : : Start_conversion: clr START set START ; reset A/D clr START ; start A/D Polling_EOC: sz EOCB ; poll the ADCR 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 Note: To power off ADC module, it is necessary to set ADONB as ²1². Example: using the interrupt method to detect the end of conversion clr ADE ; disable ADC interrupt mov a,00000001B mov ACSR,a ; select fSYS/8 as A/D clock and ADONB=0 mov a,00000100B ; setup ADCR register to configure Port as A/D inputs mov ADCR,a ; and select AN0 to be connected to the A/D : : Start_conversion: clr START set START ; reset A/D clr START ; start A/D clr ADF ; clear ADC interrupt request flag set ADE ; enable ADC interrupt set EMI ; enable global interrupt : : : ; ADC interrupt service routine ADC_: mov acc_stack,a ; save ACC to user defined memory mov a,STATUS mov status_stack,a ; save STATUS to user defined memory : : 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 : : EXIT_ISR: mov a,status_stack mov STATUS,a ; restore STATUS from user defined memory mov a,acc_stack ; restore ACC from user defined memory clr ADF ; clear ADC interrupt flag reti Note: To power off ADC module, it is necessary to set ADONB as ²1². |
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