MPXM2102AS datasheet(400/670 Pages) MOTOROLA

400 / 670 page

AN1315

3–254

Motorola Sensor Device Data

www.motorola.com/semiconductors

08CA A1 21

CMP

#33

have we shifted all possible bits in the DVSOR yet ?

08CC 26 F1

BNE

DIV151

08CE B7 98

DIV153

STA

CNT

save the loop counter so we can do the divide

08D0 B6 8F

DIV163

LDA

DVDND+3

sub 32 bit divisor from dividend

08D2 B0 93

SUB

DVSOR+3

08D4 B7 8F

STA

DVDND+3

08D6 B6 8E

LDA

DVDND+2

08D8 B2 92

SBC

DVSOR+2

08DA B7 8E

STA

DVDND+2

08DC B6 8D

LDA

DVDND+1

08DE B2 91

SBC

DVSOR+1

08E0 B7 8D

STA

DVDND+1

08E2 B6 8C

LDA

DVDND

08E4 B2 90

SBC

DVSOR

08E6 B7 8C

STA

DVDND

08E8 24 1B

BCC

DIV165

carry is clear if DVSOR was larger than DVDND

08EA B6 8F

LDA

DVDND+3

add the divisor back...was larger than the dividend

08EC BB 93

ADD

DVSOR+3

08EE B7 8F

STA

DVDND+3

08F0 B6 8E

LDA

DVDND+2

08F2 B9 92

ADC

DVSOR+2

08F4 B7 8E

STA

DVDND+2

08F6 B6 8D

LDA

DVDND+1

08F8 B9 91

ADC

DVSOR+1

08FA B7 8D

STA

DVDND+1

08FC B6 8C

LDA

DVDND

08FE B9 90

ADC

DVSOR

0900 B7 8C

STA

DVDND

0902 98

CLC

this will clear the respective bit in QUO due to

the need to add DVSOR back to DVND

0903 20 01

BRA

DIV167

0905 99

DIV165

SEC

this will set the respective bit in QUO

0906 39 97

DIV167

ROL

QUO+3

set or clear the low order bit in QUO based on above

0908 39 96

ROL

QUO+2

090A 39 95

ROL

QUO+1

090C 39 94

ROL

QUO

090E 34 90

LSR

DVSOR

divide the divisor by 2

0910 36 91

ROR

DVSOR+1

0912 36 92

ROR

DVSOR+2

0914 36 93

ROR

DVSOR+3

0916 3A 98

DEC

CNT

bump the loop counter down

0918 26 B6

BNE

DIV163

finished yet ?

091A 81

RTSyes

#endasm

091B 81

RTS

}

/***************************************************************************/

/* These interrupts are not used...give them a graceful return if for

some reason one occurs */

1FFC 09 1C

__SWI(){}

091C 80

RTI

1FFA 09 1D

IRQ(){}

091D 80

RTI

1FF8 09 1E

TIMERCAP(){}

091E 80

RTI

1FF4 09 1F

TIMEROV(){}

091F 80

RTI

1FF2 09 20

SCI(){}

0920 80

RTI

/***************************************************************************/

void sensor_type()

{

0921 B6 03

LDA

$03

k = portd & 0x0e;

/* we only care about bits 1..3 */

0923 A4 0E

AND

#$0E

0925 B7 65

STA

$65

0927 34 65

LSR

$65

k = k >> 1;

/* right justify the variable */

0929 B6 65

LDA

$65

if ( k > 4 )

092B A1 04

CMP

#$04

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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