MPXM2102AS datasheet(403/670 Pages) MOTOROLA

403 / 670 page

AN1315

3–257

Motorola Sensor Device Data

www.motorola.com/semiconductors

0A07 3F 5C

CLR

$5C

0A09 B7 5D

STA

$5D

0A0B 81

RTS

}

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

void initio (void)

setup the I/O */

{

0A0C A6 20

LDA

#$20

adstat = 0x20; /* power–up the A/D */

0A0E B7 09

STA

$09

0A10 3F 02

CLR

$02

porta = portb = portc = 0;

0A12 3F 01

CLR

$01

0A14 3F 00

CLR

$00

0A16 A6 FF

LDA

#$FF

ddra = ddrb = ddrc = 0xff;

0A18 B7 06

STA

$06

0A1A B7 05

STA

$05

0A1C B7 04

STA

$04

0A1E B6 13

LDA

$13

areg=tsr;

/* dummy read */

0A20 3F 1E

CLR

$1E

ocmphi1 = ocmphi2 = 0;

0A22 3F 16

CLR

$16

0A24 B6 1F

LDA

$1F

areg = ocmplo2; /* clear out output compare 2 if it happens to be set */

0A26 AD 9F

BSR

$09C7

fixcompare(); /* set–up for the first timer interrupt */

0A28 A6 40

LDA

#$40

tcr = 0x40;

0A2A B7 12

STA

$12

0A2C 9A

CLI

CLI;

/* let the interrupts begin !

/* write CAL to the display */

0A2D A6 CC

LDA

#$CC

portc = 0xcc; /* C */

0A2F B7 02

STA

$02

0A31 A6 BE

LDA

#$BE

portb = 0xbe; /* A */

0A33 B7 01

STA

$01

0A35 A6 C4

LDA

#$C4

porta = 0xc4; /* L */

0A37 B7 00

STA

$00

0A39 CD 09 21

JSR

$0921

sensor_type(); /* get the model of the sensor based on J1..J3 */

0A3C AD AD

BSR

$09EB

adzero();

/* auto zero */

0A3E 81

RTS

}

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

void cvt_bin_dec(unsigned long arg)

/* First converts the argument to a five digit decimal value. The msd is in

the lowest address. Then leading zero suppress the value and write it to the

display ports.

The argument value is 0..65535 decimal. */

009D

{

0A3F BF 9D

STX

$9D

0A41 B7 9E

STA

$9E

009F

char i;

00A0

unsigned long l;

0A43 3F 9F

CLR

$9F

for ( i=0; i < 5; ++i )

0A45 B6 9F

LDA

$9F

0A47 A1 05

CMP

#$05

0A49 24 07

BCC

$0A52

{

0A4B 97

TAX

digit[i] = 0x0;

/* put blanks in all digit positions */

0A4C 6F 50

CLR

$50,X

}

0A4E 3C 9F

INC

$9F

0A50 20 F3

BRA

$0A45

0A52 3F 9F

CLR

$9F

for ( i=0; i < 4; ++i )

0A54 B6 9F

LDA

$9F

0A56 A1 04

CMP

#$04

0A58 24 7A

BCC

$0AD4

{

0A5A 97

TAX

if ( arg

>= dectable [i] )

0A5B 58

LSLX

0A5C D6 08 0B

LDA

$080B,X

0A5F B0 9E

SUB

$9E

0A61 B7 58

STA

$58

0A63 B6 9D

LDA

$9D

0A65 A8 80

EOR

#$80

0A67 B7 57

STA

$57

0A69 D6 08 0A

LDA

$080A,X

0A6C A8 80

EOR

#$80

0A6E B2 57

SBC

$57

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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