MPXM2102AS datasheet(401/670 Pages) MOTOROLA

401 / 670 page

AN1315

3–255

Motorola Sensor Device Data

www.motorola.com/semiconductors

092D 23 0C

BLS

$093B

{ /* we have a set–up error in wire jumpers J1 – J3 */

092F 3F 02

CLR

$02

portc = 0;

0931 A6 6E

LDA

#$6E

portb = 0x6e;

/* S */

0933 B7 01

STA

$01

0935 A6 CE

LDA

#$CE

porta = 0xce;

/* E */

0937 B7 00

STA

$00

0939 20 FE

BRA

$0939

while(1);

}

093B B6 65

LDA

$65

sensor_index = k;

093D B7 60

STA

$60

093F 97

TAX

sensor_model = type[k];

0940 58

LSLX

0941 D6 08 12

LDA

$0812,X

0944 B7 5E

STA

$5E

0946 D6 08 13

LDA

$0813,X

0949 B7 5F

STA

$5F

094B 81

RTS

}

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

void sensor_slope()

{

094C B6 03

LDA

$03

k=portd & 0xf0;

/* we only care about bits 4..7 */

094E A4 F0

AND

#$F0

0950 B7 65

STA

$65

0952 34 65

LSR

$65

k = k >> 4;

/* right justify the variable */

0954 34 65

LSR

$65

0956 34 65

LSR

$65

0958 34 65

LSR

$65

095A BE 65

LDX

$65

slope = slope_const[k];

095C 58

LSLX

095D D6 08 1C

LDA

$081C,X

0960 B7 59

STA

$59

0962 D6 08 1D

LDA

$081D,X

0965 B7 5A

STA

$5A

0967 81

RTS

}

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

void delay(void)

/* just hang around for a while */

{

0968 3F 62

CLR

$62

for (i=0; i<20000; ++i);

096A 3F 61

CLR

$61

096C B6 62

LDA

$62

096E A0 20

SUB

#$20

0970 B6 61

LDA

$61

0972 A2 4E

SBC

#$4E

0974 24 08

BCC

$097E

0976 3C 62

INC

$62

0978 26 02

BNE

$097C

097A 3C 61

INC

$61

097C 20 EE

BRA

$096C

097E 81

RTS

}

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

read_a2d(void)

{

/* read the a/d converter on channel 5 and accumulate the result

in atodtemp */

097F 3F 56

CLR

$56

atodtemp=0;

/* zero for accumulation */

0981 3F 55

CLR

$55

0983 3F 5B

CLR

$5B

for ( adcnt = 0 ; adcnt<100; ++adcnt) /* do 100 a/d conversions */

0985 B6 5B

LDA

$5B

0987 A8 80

EOR

#$80

0989 A1 E4

CMP

#$E4

098B 24 21

BCC

$09AE

{

098D A6 20

LDA

#$20

adstat = 0x20;

/* convert on channel 0 */

098F B7 09

STA

$09

0991 0F 09 FD

BRCLR 7,$09,$0991

while (!(adstat & 0x80));

/* wait for a/d to complete */

0994 B6 08

LDA

$08

atodtemp = addata + atodtemp;

0996 3F 57

CLR

$57

0998 B7 58

STA

$58

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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