MPXM2102AS datasheet(402/670 Pages) MOTOROLA

402 / 670 page

AN1315

3–256

Motorola Sensor Device Data

www.motorola.com/semiconductors

099A BB 56

ADD

$56

099C B7 58

STA

$58

099E B6 57

LDA

$57

09A0 B9 55

ADC

$55

09A2 B7 57

STA

$57

09A4 B7 55

STA

$55

09A6 B6 58

LDA

$58

09A8 B7 56

STA

$56

}

09AA 3C 5B

INC

$5B

09AC 20 D7

BRA

$0985

09AE B6 56

LDA

$56

atodtemp = atodtemp/100;

09B0 B7 58

STA

$58

09B2 B6 55

LDA

$55

09B4 B7 57

STA

$57

09B6 3F 9A

CLR

$9A

09B8 A6 64

LDA

#$64

09BA B7 9B

STA

$9B

09BC CD 0B F1

JSR

$0BF1

09BF CD 0C 22

JSR

$0C22

09C2 BF 55

STX

$55

09C4 B7 56

STA

$56

09C6 81

RTS

return atodtemp;

}

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

void fixcompare (void)

/* sets–up the timer compare for the next interrupt */

{

09C7 B6 18

LDA

$18

q.b.hi =tcnthi;

09C9 B7 66

STA

$66

09CB B6 19

LDA

$19

q.b.lo = tcntlo;

09CD B7 67

STA

$67

09CF AB 4C

ADD

#$4C

q.l +=7500;

/* ((4mhz xtal/2)/4) = counter period = 2us.*7500 = 15ms. */

09D1 B7 67

STA

$67

09D3 B6 66

LDA

$66

09D5 A9 1D

ADC

#$1D

09D7 B7 66

STA

$66

09D9 B7 16

STA

$16

ocmphi1 = q.b.hi;

09DB B6 13

LDA

$13

areg=tsr;

/* dummy read */

09DD B6 67

LDA

$67

ocmplo1 = q.b.lo;

09DF B7 17

STA

$17

09E1 81

RTS

}

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

void TIMERCMP (void)

/* timer service module */

1FF6 09 E2

{

09E2 33 02

COM

$02

portc =~ portc;

/* service the lcd by inverting the ports */

09E4 33 01

COM

$01

portb =~ portb;

09E6 33 00

COM

$00

porta =~ porta;

09E8 AD DD

BSR

$09C7

fixcompare();

09EA 80

RTI

}

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

void adzero(void)

/* called by initio() to save initial xdcr’s zero

pressure offset voltage output */

{

09EB 3F 64

CLR

$64

for ( j=0; j<20; ++j)

/* give the sensor time to ”warm–up” and the

09ED 3F 63

CLR

$63

09EF B6 64

LDA

$64

09F1 A0 14

SUB

#$14

09F3 B6 63

LDA

$63

09F5 A2 00

SBC

#$00

09F7 24 0B

BCC

$0A04

power supply time to settle down */

{

09F9 CD 09 68

JSR

$0968

delay();

}

09FC 3C 64

INC

$64

09FE 26 02

BNE

$0A02

0A00 3C 63

INC

$63

0A02 20 EB

BRA

$09EF

0A04 CD 09 7F

JSR

$097F

xdcr_offset =

read_a2d();

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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