MPXM2102AS datasheet(399/670 Pages) MOTOROLA

399 / 670 page

AN1315

3–253

Motorola Sensor Device Data

www.motorola.com/semiconductors

Multiplier:

MULTP[0..3]

Multiplicand:

MULCAN[0..3]

Output:

Product:

MTEMP[0..3] AND MULCAN[0..3] MTEMP[0] IS THE HIGH

ORDER BYTE AND MULCAN[3] IS THE LOW ORDER BYTE

THIS ROUTINE DOES NOT USE THE MUL INSTRUCTION FOR THE SAKE OF USERS NOT

USING THE HC(7)05 SERIES PROCESSORS.

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

0870 AE 20

LDX

#32

loop counter

0872 3F 84

CLR

MTEMP

clean–up for result

0874 3F 85

CLR

MTEMP+1

0876 3F 86

CLR

MTEMP+2

0878 3F 87

CLR

MTEMP+3

087A 36 88

ROR

MULCAN

low but to carry, the rest one to the right

087C 36 89

ROR

MULCAN+1

087E 36 8A

ROR

MULCAN+2

0880 36 8B

ROR

MULCAN+3

0882 24 18

MNEXT

BCC

ROTATE

if carry is set, do the add

0884 B6 87

LDA

MTEMP+3

0886 BB 83

ADD

MULTP+3

0888 B7 87

STA

MTEMP+3

088A B6 86

LDA

MTEMP+2

088C B9 82

ADC

MULTP+2

088E B7 86

STA

MTEMP+2

0890 B6 85

LDA

MTEMP+1

0892 B9 81

ADC

MULTP+1

0894 B7 85

STA

MTEMP+1

0896 B6 84

LDA

MTEMP

0898 B9 80

ADC

MULTP

089A B7 84

STA

MTEMP

089C 36 84

ROTATE

ROR

MTEMP

else: shift low bit to carry, the rest to the right

089E 36 85

ROR

MTEMP+1

08A0 36 86

ROR

MTEMP+2

08A2 36 87

ROR

MTEMP+3

08A4 36 88

ROR

MULCAN

08A6 36 89

ROR

MULCAN+1

08A8 36 8A

ROR

MULCAN+2

08AA 36 8B

ROR

MULCAN+3

08AC 5A

DEX

bump the counter down

08AD 26 D3

BNE

MNEXT

done yet ?

08AF 81

RTS

done

#endasm

08B0 81

RTS

}

void div32()

{

#asm

* Divide 32 bit by 32 bit unsigned integer routine

Input:

Dividend:

DVDND [+0..+3] HIGH ORDER BYTE IS DVND+0

Divisor:

DVSOR [+0..+3] HIGH ORDER BYTE IS DVSOR+0

Output:

Quotient:

QUO [+0..+3]

HIGH ORDER BYTE IS QUO+0

08B1 3F 94

CLR

QUOzero result registers

08B3 3F 95

CLR

QUO+1

08B5 3F 96

CLR

QUO+2

08B7 3F 97

CLR

QUO+3

08B9 A6 01

LDA

initial loop count

08BB 3D 90

TST

DVSOR

if the high order bit is set..no need to shift DVSOR

08BD 2B 0F

BMI

DIV153

08BF 4C

DIV151

INCA

bump the loop counter

08C0 38 93

ASL

DVSOR+3

now shift the divisor until the high order bit = 1

08C2 39 92

ROL

DVSOR+2

08C4 39 91

ROL

DVSOR+1

08C6 39 90

ROL

DVSOR

08C8 2B 04

BMI

DIV153

done if high order bit = 1

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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