MPXM2102AS datasheet(398/670 Pages) MOTOROLA

398 / 670 page

AN1315

3–252

Motorola Sensor Device Data

www.motorola.com/semiconductors

/* variables for div32 */

008C 0004

unsigned long DVDND[2];

Dividend

0090 0004

unsigned long DVSOR[2];

Divisor

0094 0004

unsigned long QUO[2];

Quotient

0098

unsigned int

CNT;

Loop counter

/* The code starts here */

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

void add32()

{

#asm

*––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––*

* Add two 32–bit values.

Inputs:

ADDEND: ADDEND[0..3]

HIGH ORDER BYTE IS ADDEND+0

AUGEND: AUGEND[0..3]

HIGH ORDER BYTE IS AUGEND+0

Output:

SUM: SUM[0..3]

HIGH ORDER BYTE IS SUM+0

083C B6 6F

LDA

ADDEND+3

low byte

083E BB 73

ADD

AUGEND+3

0840 B7 6B

STA

SUM+3

0842 B6 6E

LDA

ADDEND+2

medium low byte

0844 B9 72

ADC

AUGEND+2

0846 B7 6A

STA

SUM+2

0848 B6 6D

LDA

ADDEND+1

medium high byte

084A B9 71

ADC

AUGEND+1

084C B7 69

STA

SUM+1

084E B6 6C

LDA

ADDEND

high byte

0850 B9 70

ADC

AUGEND

0852 B7 68

STA

SUM

0854 81

RTS

done

#endasm

0855 81

RTS

}

void sub32()

{

#asm

* Subtract two 32–bit values.

Input:

Minuend: MINUE[0..3]

Subtrahend: SUBTRA[0..3]

Output:

Difference: DIFF[1..0]

0856 B6 77

LDA

MINUE+3

low byte

0858 B0 7B

SUB

SUBTRA+3

085A B7 7F

STA

DIFF+3

085C B6 76

LDA

MINUE+2

medium low byte

085E B2 7A

SBC

SUBTRA+2

0860 B7 7E

STA

DIFF+2

0862 B6 75

LDA

MINUE+1

medium high byte

0864 B2 79

SBC

SUBTRA+1

0866 B7 7D

STA

DIFF+1

0868 B6 74

LDA

MINUE

high byte

086A B2 78

SBC

SUBTRA

086C B7 7C

STA

DIFF

086E 81

RTS

done

#endasm

086F 81

RTS

}

void mul32()

{

#asm

* Multiply 32–bit value by a 32–bit value

Input:

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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