MPXM2102AS datasheet(554/670 Pages) MOTOROLA

554 / 670 page

AN1950

3–408

Motorola Sensor Device Data

www.motorola.com/semiconductors

adc

sta

lda

adc

sta

;and add into NC:NB:NA

lsla

bcs

nornd

;if carry=1 then remainder<1/2 of dividend

lda

add

#$01

sta

lda

adc

#$00

sta

;otherwise add 1 to result

nornd:

rts

;__________________________________________________________

UNITS:

lda

#$01

;===UNITS=== : displays A/D value, calib max/min values

jsr

lcdcmdo

;clear screen

UNTwarm:

lda

#$0C

jsr

lcdcmdo

;cursor off

lda

#$80

jsr

lcdcmdo

;(pos cursor begining of first line)

jsr

adcbyta

;get Lref: reference A/D reading

bset

4,porta

;SEL LED–ON signals getting reading

jsr

lcdbyto

jsr

del1s

bclr

4,porta

;SEL LED–OFF signals reading received

jsr

adcbyta

;get Lref: reference A/D reading

tstLfNx:

sub

;*** PX=f(NX,N2,N1) ***

cmp

#$00

; IF Nx – N1 > 0 then calculate

bgt

skipzero

lda

#’–’

; Else IF Nx << N1 then display error message to recalibrate

jsr

lcdbyto

lda

#’–’

jsr

lcdbyto

bra

skipneg

skipzero:

ldx

#$A0

;x160

mul

sta

stx

clr

;NCNBNA:=(NX–N1)*160

lda

#$90

jsr

lcdcmdo

;(pos cursor 2nd half of first line)

jsr

lcdbyto

;

display NA

lda

#$87

jsr

lcdcmdo

lda

jsr

lcdbyto

;

display NB

skipneg:

jsr

del1s

;1s between pressure/altitude readings

brset

1,porta,UNTcon ;exit only if SEL

brset

2,porta,UNTcon ;and ENT pressed together

jmp

UNTcon:

jmp

UNTwarm

;__________________________

MANCALIB:

jsr

del1s

rts

TEST:

jsr

del1s

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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