MPXM2202GS datasheet(135/670 Pages) MOTOROLA

135 / 670 page

AN1635

2–99

Motorola Sensor Device Data

www.motorola.com/semiconductors

ADDSUM3

CLRA

ADDD

SUM3

STD

SUM3

CALDLT4

LDAB

ADR4,X

SUBB

OFFSET4

BPL

ADDSUM4

COMB

INCB

ADDSUM4

CLRA

ADDD

SUM4

STD

SUM4

LDD

COUNT

ADDD

#$0001

STD

COUNT

CPD

#SAMPLES

BLO

ADCREAD

PULB

PULA

PULX

RTS

* This subroutine computes the ball speed by dividing the overall sum by a constant.

COMPUTE

PSHX

PSHA

PSHB

LDD

SUM1

ADDD

SUM2

ADDD

SUM3

ADDD

SUM4

STD

GRNDSUM

LDX

#PRPFCTR

IDIV

XGDX

STAB

CURBIN

PULB

PULA

PULX

RTS

* This subroutine converts from binary to BCD. (Limited to number up to 99 decimal.)

BINTBCD

PSHX

PSHA

PSHB

LDX

#$0000

LDAA

CURBIN

STAA

TEMPBIN

CLRA

CLRB

BINSHFT

LSL

TEMPBIN

ROLB

LSLA

CMPB

#$10

BLO

CHKDONE

INCA

ANDB

#$0F

CHKDONE

INX

CPX

#$0008

BEQ

RAILAT9

CHKFIVE

CMPB

#$05

BLO

BINSHFT

ADDB

#$03

BRA

BINSHFT

RAILAT9

CMPA

#$09

;Force the display to “99” if speed > 100 mph.

BLS

DONE

LDD

#$0909

DONE

STD

BCD

LDX

#SEVSEG

;This part finds the seven segment display codes.

XGDX

ADDB

BCD

XGDX

LDAA

$00,X

STAA

CURDSPL

LDX

#SEVSEG

XGDX

ADDB

BCD+1

XGDX

LDAA

$00,X

STAA

CURDSPL+1

PULB

PULA

PULX

RTS

* This subroutine displays the current speed for 5 seconds & then displays the maximum.

OUTPUT

PSHX

PSHA

PSHB

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2202GS 数据表(PDF) 135 Page - Motorola, Inc

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