MPXM2102AS datasheet(553/670 Pages) MOTOROLA

553 / 670 page

AN1950

3–407

Motorola Sensor Device Data

www.motorola.com/semiconductors

dec

;do this for all 8 CGRAM characters

bne

cg8

lda

weath

;get weather variable and decide which message to display

cmp

#$04

bne

try3210

ldhx

#msg02e

;if $04

bra

showit

try3210:

cmp

#$03

bne

try210

ldhx

#msg02d

;if $03

bra

showit

try210:

cmp

#$02

bne

try10

ldhx

#msg02c

;if $02

bra

showit

try10:

cmp

#$01

bne

try0

ldhx

#msg02b

;if $01

bra

showit

try0:

ldhx

#msg02a

;otherwise this one

showit:

jsr

lcdstro

jsr

del1s

;1s between pressure/altitude readings

brset

1,porta,contin ;exit only if SEL

brset

2,porta,contin ;and ENT pressed together

jmp

contin:

jmp

LVLwarm

;__________________________________________________________

LfNx:

sub

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

ldx

#$A0

;x160

mul

sta

stx

clr

;NCNBNA:=(NX–N1)*160

lda

sub

sta

clr

jsr

NdivD

;RBRA:=(NX–N1)*160/(N2–N1)

lda

rts

;__________________________________________________________

NdivD:

clr

;RBRA:=NCNBNA/DCDBDA

clr

;destroys NCNBNA and DCDBDA

keepatit: lda

add

#$01

sta

lda

adc

#$00

sta

;increment RB:RA

lda

sub

sta

lda

sbc

sta

lda

sbc

sta

;NC:NB:NA:=NC:NB:NA–DC:DB:DA

bcc

keepatit

;keep counting how many times until overflow

lda

sub

#$01

sta

lda

sbc

#$00

sta

;we counted once too many, so undo that

lsr

ror

;divide DC:DB:DA by 2

lda

add

sta

lda

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2102AS Datasheet(PDF) 553 Page - Motorola, Inc

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