MPXM2102AS datasheet(377/670 Pages) MOTOROLA

377 / 670 page

AN1305

3–231

Motorola Sensor Device Data

www.motorola.com/semiconductors

099A 3D 50

TST

$50

if ( digit[0] == 0 )

/* leading zero suppression */

099C 26 04

BNE

$09A2

099E 3F 02

CLR

$02

portc = 0;

09A0 20 07

BRA

$09A9

else

09A2 BE 50

LDX

$50

portc = ( lcdtab[digit[0]] );

/* 100’s digit */

09A4 D6 08 00

LDA

$0800,X

09A7 B7 02

STA

$02

09A9 3D 50

TST

$50

if ( digit[0] == 0 && digit[1] == 0 )

09AB 26 08

BNE

$09B5

09AD 3D 51

TST

$51

09AF 26 04

BNE

$09B5

09B1 3F 01

CLR

$01

portb=0;

09B3 20 07

BRA

$09BC

else

09B5 BE 51

LDX

$51

portb = ( lcdtab[digit[1]] );

/* 10’s digit */

09B7 D6 08 00

LDA

$0800,X

09BA B7 01

STA

$01

09BC BE 52

LDX

$52

porta = ( lcdtab[digit[2]]+1 ); /* 1’s digit + decimal point */

09BE D6 08 00

LDA

$0800,X

09C1 4C

INCA

09C2 B7 00

STA

$00

09C4 9A

CLI

CLI;

09C5 CD 08 17

JSR

$0817

delay();

09C8 81

RTS

}

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

void display_psi(void)

/* At power–up it is assumed that the pressure port of the sensor

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

sensor and power to stabilize. One hundred A/D conversions are

averaged and divided by 100. The 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. That result is multiplied by a constant to yield

pressure in PSI * 10 to yield a ”decimal point”.

{

while(1)

{

09C9 3F 59

CLR

$59

slope = 64;

09CB A6 40

LDA

#$40

09CD B7 5A

STA

$5A

09CF B6 03

LDA

$03

k = portd & 0xc0;

/* this lets us ”rubber” the slope to closer fit

09D1 A4 C0

AND

#$C0

09D3 B7 62

STA

$62

the slope of the sensor */

09D5 A1 80

CMP

#$80

if ( k == 0x80 )

/* J2 removed, J1 installed */

09D7 26 06

BNE

$09DF

09D9 3F 59

CLR

$59

slope = 65;

09DB A6 41

LDA

#$41

09DD B7 5A

STA

$5A

09DF B6 62

LDA

$62

if ( k == 0x40 ) /* J1 removed, J2 installed */

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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