MPXM2102AS datasheet(374/670 Pages) MOTOROLA

374 / 670 page

AN1305

3–228

Motorola Sensor Device Data

www.motorola.com/semiconductors

089B 33 02

COM

$02

portc =~ portc;

/* service the lcd */

089D 33 01

COM

$01

portb =~ portb;

089F 33 00

COM

$00

porta =~ porta;

08A1 AD DD

BSR

$0880

fixcompare();

08A3 80

RTI

}

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

void adzero(void)

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

pressure offset voltage output */

{

08A4 4F

CLRA

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

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

08A5 3F 57

CLR

$57

08A7 B7 58

STA

$58

08A9 B6 57

LDA

$57

08AB B7 60

STA

$60

08AD B6 58

LDA

$58

08AF B7 61

STA

$61

08B1 B6 61

LDA

$61

08B3 A0 14

SUB

#$14

08B5 B6 60

LDA

$60

08B7 A2 00

SBC

#$00

08B9 24 0B

BCC

$08C6

power supply time to settle down */

{

08BB CD 08 17

JSR

$0817

delay();

}

08BE 3C 61

INC

$61

08C0 26 02

BNE

$08C4

08C2 3C 60

INC

$60

08C4 20 EB

BRA

$08B1

08C6 CD 08 37

JSR

$0837

xdcr_offset =

read_a2d();

08C9 3F 5C

CLR

$5C

08CB B7 5D

STA

$5D

08CD 81

RTS

}

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

void initio (void)

setup the I/O */

{

08CE A6 20

LDA

#$20

adstat = 0x20; /* power–up the A/D */

08D0 B7 09

STA

$09

08D2 3F 02

CLR

$02

porta = portb = portc = 0;

08D4 3F 01

CLR

$01

08D6 3F 00

CLR

$00

08D8 A6 FF

LDA

#$FF

ddra = ddrb = ddrc = 0xff;

08DA B7 06

STA

$06

08DC B7 05

STA

$05

08DE B7 04

STA

$04

08E0 B6 13

LDA

$13

ac=tsr;

/* dummy read */

08E2 3F 1E

CLR

$1E

ocmphi1 = ocmphi2 = 0;

08E4 3F 16

CLR

$16

08E6 B6 1F

LDA

$1F

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

08E8 AD 96

BSR

$0880

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

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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