Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario descargar pdf (Pagina 91)

MAXQ Family User’s Guide:

MAXQ2010 Supplement

19-9

19.3 Analog-to-Digital Converter Code Examples

19.3.1 ADC Example 1: Single Conversion

move ADCN, #0300h ; Set ADC clock to sysclk/8 (78ksps at 10MHz)

move ADST, #0010h ; Points ADDATA to config register 0

move ADDATA, #06h ; Single-ended conversion on channel AN6, AVDD ref

move ADST.6, #1 ; Start conversion

waitConvert:

move C, ADST.6

jump C, waitConvert ; Conversion has completed when ADST.6 clears to 0

move ADST, #0000h ; Points ADDATA to data register 0

move Acc, ADDATA ; Get conversion result

19.3.2 ADC Example 2: Continuous Conversion

move ADCN, #0F00h ; Set ADC clock to sysclk/8 (78ksps at 10MHz),

; also set Data Available interrupt to trigger

; following every 16 samples

move ADCN.6, #1 ; Enable continuous conversion mode

move ADST, #0010h ; Points ADDATA to config register 0

move ADDATA, #06h ; ACFG[0]: Single-ended conversion on AN6, AVDD ref

move ADDATA, #07h ; ACFG[1]: Single-ended conversion on AN7, AVDD ref

move ADADDR, #0001h ; Sequence runs from ACFG[0] to ACFG[1] inclusive

move ADST.6, #1 ; Start conversion (continuous)

waitConvert:

move C, ADST.5

jump NC, waitConvert ; Wait for 16 samples to be captured (ADDAI=1)

move ADST.6, #0 ; Stop conversion

move ADST.5, #0 ; Clear data available flag

move ADST, #0000h ; Points ADDATA to data register 0

move A[0], ADDATA ; Get conversion data

move A[1], ADDATA

move A[2], ADDATA

move A[3], ADDATA

move A[4], ADDATA

move A[5], ADDATA

ADDIFF ADCH2 ADCH1 ADCH0 ADC CONVERSION TYPE

1 X 0 0 Differential conversion: (AN0–AN1)

1 X 0 1 Differential conversion: (AN2–AN3)

1 X 1 0 Differential conversion: (AN4–AN5)

1 X 1 1 Differential conversion: (AN6–AN7)

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 146 147

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Maxim-integrated MAXQ Family Users Guide: MAXQ2010 Supplement Manual de usuario Pagina 91