MPXM2102AS datasheet(405/670 Pages) MOTOROLA

405 / 670 page

AN1315

3–259

Motorola Sensor Device Data

www.motorola.com/semiconductors

0B03 B7 01

STA

$01

0B05 BE 54

LDX

$54

porta = ( lcdtab[digit[4]] );

/* 1’s digit */

0B07 D6 08 00

LDA

$0800,X

0B0A B7 00

STA

$00

/* place the decimal point only if the sensor is 15 psi or 7.5 psi */

0B0C B6 60

LDA

$60

if ( sensor_index < 3 )

0B0E A8 80

EOR

#$80

0B10 A1 83

CMP

#$83

0B12 24 08

BCC

$0B1C

0B14 BE 54

LDX

$54

porta = ( lcdtab[digit[4]]+1 ); /* add the decimal point to the lsd */

0B16 D6 08 00

LDA

$0800,X

0B19 4C

INCA

0B1A B7 00

STA

$00

0B1C 3D 60

TST

$60

if(sensor_index ==0) /* special case */

0B1E 26 0F

BNE

$0B2F

{

0B20 BE 54

LDX

$54

porta = ( lcdtab[digit[4]] ); /* get rid of the decimal at lsd */

0B22 D6 08 00

LDA

$0800,X

0B25 B7 00

STA

$00

0B27 BE 53

LDX

$53

portb = ( lcdtab[digit[3]]+1 ); /* decimal point at middle digit */

0B29 D6 08 00

LDA

$0800,X

0B2C 4C

INCA

0B2D B7 01

STA

$01

}

0B2F 9A

CLI

CLI;

0B30 CD 09 68

JSR

$0968

delay();

0B33 81

RTS

}

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

void display_psi(void)

At power–up it is assumed that the pressure or vacuum port of

the sensor is open to atmosphere. The code in initio() delays

for the sensor and power supply to stabilize. One hundred A/D

conversions are averaged. That result is called xdcr_offset.

This routine calls the A/D routine which performs one hundred

conversions, divides the result by 100 and returns the value.

If the value returned is less than or equal to the xdcr_offset,

the value of xdcr_offset is substituted. If the value returned

is greater than xdcr_offset, xdcr_offset is subtracted from the

returned value.

{

while(1)

{

0B34 CD 09 7F

JSR

$097F

atodtemp = read_a2d();

/* atodtemp = raw a/d ( 0..255 ) */

0B37 3F 55

CLR

$55

0B39 B7 56

STA

$56

0B3B B0 5D

SUB

$5D

if ( atodtemp <= xdcr_offset )

0B3D B7 58

STA

$58

0B3F B6 5C

LDA

$5C

0B41 A8 80

EOR

#$80

0B43 B7 57

STA

$57

0B45 B6 55

LDA

$55

0B47 A8 80

EOR

#$80

0B49 B2 57

SBC

$57

0B4B BA 58

ORA

$58

0B4D 22 08

BHI

$0B57

0B4F B6 5C

LDA

$5C

atodtemp = xdcr_offset;

0B51 B7 55

STA

$55

0B53 B6 5D

LDA

$5D

0B55 B7 56

STA

$56

0B57 B6 56

LDA

$56

atodtemp –=

xdcr_offset; /* remove the offset */

0B59 B0 5D

SUB

$5D

0B5B B7 56

STA

$56

0B5D B6 55

LDA

$55

0B5F B2 5C

SBC

$5C

0B61 B7 55

STA

$55

0B63 CD 09 4C

JSR

$094C

sensor_slope();

/* establish the slope constant for this output */

0B66 B6 56

LDA

$56

atodtemp *= sensor_model;

0B68 B7 58

STA

$58

0B6A B6 55

LDA

$55

0B6C B7 57

STA

$57

0B6E B6 5E

LDA

$5E

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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