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MPXM2102AS Datasheet(PDF) 549 Page - Motorola, Inc |
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MPXM2102AS Datasheet(HTML) 549 Page - Motorola, Inc |
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549 / 670 page  AN1950 3–403 Motorola Sensor Device Data www.motorola.com/semiconductors jmp MANCALIB skip02: jmp TEST ;__________________________________________________________ ;__________________________________________________________ CALIB: ldhx #msg05 ;===CALIB=== 2–point calibration jsr lcdstro ;Calibration current values lda N1 ;0mm jsr lcdbyto lda #’/’ jsr lcdchro lda N2 ;160mm jsr lcdbyto bset 4,porta bset 5,porta ;LEDs on lego1: brclr 1,porta,lego1 lego2: brclr 2,porta,lego2 bclr 4,porta bclr 5,porta ;LEDs off when both SEL & ENT are released jsr del1s jsr del1s ;wait 2s ldhx #msg05a jsr lcdstro ;show instructions waitPB1: brset 2,porta,no2 ;if ENT is not pressed, skip jmp nocalib ;if ENT is pressed then cancel calibration no2: brclr 1,porta,do1st ;if SEL is pressed then do 1st point cal bra waitPB1 ;otherwise wait for SEL do1st: ldhx #msg05b ;1st point cal: show values jsr lcdstro clr CNT ;CNT will count 256 A/D readings clr RB clr RA ;RB:RA contains 16–bit add–up of those 256 values do256: lda #$C9 jsr lcdcmdo ;position LCD cursor at the right spot lda CNT deca jsr lcdbyto ;display current iteration $FF downto $00 lda #’:’ jsr lcdchro jsr adcbyti ;get reading add RA sta RA lda RB adc #$00 sta RB ;add into RB:RA (16 bit add) jsr lcdbyto ;show RB lda RA jsr lcdbyto ;then RA dbnz CNT,do256 ;and do 256x lsl RA ;get bit7 into carry bcc nochg ;if C=0 then no need to round up inc RB ;otherwise round up nochg: lda RB ;we can discard RA: average value is in RB ldhx #N1 ;point to flash location jsr wrflash ;burn it in! ldhx #msg05c ;ask for 160mm jsr lcdstro waitPB2: brset 2,porta,waitPB2 ;wait for ENT ldhx #msg05d ;2nd point cal: show values jsr lcdstro clr CNT ;ditto as 1st point cal clr RB clr RA do256b: lda #$C9 jsr lcdcmdo lda CNT deca jsr lcdbyto lda #’:’ jsr lcdchro jsr adcbyti add RA sta RA lda RB adc #$00 sta RB Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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