MPXM2102AS datasheet(372/670 Pages) MOTOROLA

372 / 670 page

AN1305

3–226

Motorola Sensor Device Data

www.motorola.com/semiconductors

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

/* code starts here */

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

/* these interrupts are not used...give them a graceful return if for

some reason one occurs */

1FFC 08 12

__SWI(){}

0812 80

RTI

1FFA 08 13

IRQ(){}

0813 80

RTI

1FF8 08 14

TIMERCAP(){}

0814 80

RTI

1FF4 08 15

TIMEROV(){}

0815 80

RTI

1FF2 08 16

SCI(){}

0816 80

RTI

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

void delay(void)

/* just hang around for a while */

{

0817 4F

CLRA

for (i=0; i<20000; ++i);

0818 3F 57

CLR

$57

081A B7 58

STA

$58

081C B6 57

LDA

$57

081E B7 5E

STA

$5E

0820 B6 58

LDA

$58

0822 B7 5F

STA

$5F

0824 B6 5F

LDA

$5F

0826 A0 20

SUB

#$20

0828 B6 5E

LDA

$5E

082A A2 4E

SBC

#$4E

082C 24 08

BCC

$0836

082E 3C 5F

INC

$5F

0830 26 02

BNE

$0834

0832 3C 5E

INC

$5E

0834 20 EE

BRA

$0824

0836 81

RTS

}

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

read_a2d(void)

{

/* read the a/d converter on channel 5 and accumulate the result

in atodtemp */

0837 3F 56

CLR

$56

atodtemp=0;

/* zero for accumulation */

0839 3F 55

CLR

$55

083B 4F

CLRA

for ( adcnt = 0 ; adcnt<100; ++adcnt) /* do 100 a/d conversions */

083C B7 5B

STA

$5B

083E B6 5B

LDA

$5B

0840 A8 80

EOR

#$80

0842 A1 E4

CMP

#$E4

0844 24 21

BCC

$0867

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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