AN413 datasheet(37/45 Pages) STMICROELECTRONICS

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AN413

Examples of A/D converter configurations

Doc ID 1875 Rev 2

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Appendix D

Examples of A/D converter configurations

;*********************************************************************

proc SG_CONV{

; A/D Converter is configured as follows:

;

- one shot conversion

;

- power up mode

;

- IT upon End of Conversion

;

- Start mode

;

- Autoscan from channel number AD_CONV

;

- No INT upon Analog Compare

spp #AD0_PG

; A/D converter register page

ld AD_CLR,#00000100b ; Control logic register

; power up

; Stop

; Single mode

; Channel 0

ld AD_CRR,#00h

; Compare result register

ld AD_ICR,#00100000b ; Interrupt control register

; mask analog watchdog

; enable end of conversion

or AD_ICR,#IT_CAD_LEVEL ; Priority level = 6

ld AD_IVR,#ADC_IT_VECT ; Interrupt vector register

ld r0,ad_conv ; AD_CONV = channel number

swap r0

rcf

rlc r0 ; mask for channel number

or AD_CLR,r0 ; start conversion address

ld R10, #40

loop [R10] {

; wait 60ms before start the first

; conversion

nop

}

or AD_CLR,#st ; start conversion

}

;*************************************************************

; A/D END OF CONVERSION INTERRUPT SUBROUTINE

ADC_EOC:

spp #AD0_PG ; A/D converter register page

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