MPXM2202GS datasheet(134/670 Pages) MOTOROLA

134 / 670 page

AN1635

2–98

Motorola Sensor Device Data

www.motorola.com/semiconductors

* This is the main program loop.

ORG

CODEBGN

START

LDS

#STACK

LDX

#REGOFF

JSR

LEDINIT

JSR

ADCINIT

JSR

VARINIT

MAIN

JSR

CAPTURE

JSR

COMPUTE

JSR

BINTBCD

JSR

OUTPUT

BRA

MAIN

* This subroutine initializes ports B & C, and the LED display.

LEDINIT

PSHX

PSHA

LDX

#REGOFF

BSET

DDRC,X,ALLONES

;Configure port C as an output.

LDAA

SEVSEG

STAA

PORTB,X

STAA

PORTC,X

PULA

PULX

RTS

* This subroutine initializes the analog to digital converter.

ADCINIT

PSHX

PSHA

LDX

#REGOFF

BSET

OPTION,X,ADPU

;Turn on A/D converter via ADPU bit.

BCLR

OPTION,X,CSEL

;Select system e clock via CSEL bit.

CLRA

DELAY

INCA

BNE

DELAY

PULA

PULX

RTS

* This subroutine clears all the memory variables.

VARINIT

PSHX

LDX

#$0000

CLRVAR

CLR

OFFSET1,X

INX

CPX

#RAMBYTS

;Number of RMB bytes.

BLO

CLRVAR

DONECLR

LDX

#REGOFF

LDAA

#CHNLS47

;Measure the offset.

STAA

ADCTL,X

OFSWAIT

BRCLR

ADCTL,X,CCF,OFSWAIT

LDD

ADR1,X

STD

OFFSET1

LDD

ADR3,X

STD

OFFSET3

PULX

RTS

* This subroutine waits for impact and computes the area under the curve.

CAPTURE

PSHX

PSHA

PSHB

LDX

#REGOFF

BSET

TCTL2,X,IC1FLE

;Set IC1 to detect falling edge only.

BCLR

TFLG1,X,IC1FCLR

MONITOR

BRCLR

TFLG1,X,IC1F,MONITOR

ADCREAD

LDAA

#CHNLS47

;Select channels 4 – 7 for conversion.

STAA

ADCTL,X

ADCWAIT

BRCLR

ADCTL,X,CCF,ADCWAIT

CALDLT1

LDAB

ADR1,X

SUBB

OFFSET1

BPL

ADDSUM1

COMB

INCB

ADDSUM1

CLRA

ADDD

SUM1

STD

SUM1

CALDLT2

LDAB

ADR2,X

SUBB

OFFSET2

BPL

ADDSUM2

COMB

INCB

ADDSUM2

CLRA

ADDD

SUM2

STD

SUM2

CALDLT3

LDAB

ADR3,X

SUBB

OFFSET3

BPL

ADDSUM3

COMB

INCB

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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