MPXM2102AS datasheet(373/670 Pages) MOTOROLA

373 / 670 page

AN1305

3–227

Motorola Sensor Device Data

www.motorola.com/semiconductors

{

0846 A6 25

LDA

#$25

adstat = 0x25;

/* convert on channel 5 */

0848 B7 09

STA

$09

084A 0F 09 FD

BRCLR 7,$09,$084A

while (!(adstat & 0x80));

/* wait for a/d to complete */

084D B6 08

LDA

$08

atodtemp = addata + atodtemp;

084F 3F 57

CLR

$57

0851 B7 58

STA

$58

0853 BB 56

ADD

$56

0855 B7 58

STA

$58

0857 B6 57

LDA

$57

0859 B9 55

ADC

$55

085B B7 57

STA

$57

085D B7 55

STA

$55

085F B6 58

LDA

$58

0861 B7 56

STA

$56

}

0863 3C 5B

INC

$5B

0865 20 D7

BRA

$083E

0867 B6 56

LDA

$56

atodtemp = atodtemp/100;

0869 B7 58

STA

$58

086B B6 55

LDA

$55

086D B7 57

STA

$57

086F 3F 66

CLR

$66

0871 A6 64

LDA

#$64

0873 B7 67

STA

$67

0875 CD 0A 5E

JSR

$0A5E

0878 CD 0A 8F

JSR

$0A8F

087B BF 55

STX

$55

087D B7 56

STA

$56

087F 81

RTS

return atodtemp;

}

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

void fixcompare (void) /* sets–up the timer compare for the next interrup */

{

0880 B6 18

LDA

$18

q.b.hi =tcnthi;

0882 B7 63

STA

$63

0884 B6 19

LDA

$19

q.b.lo = tcntlo;

0886 B7 64

STA

$64

0888 AB 4C

ADD

#$4C

q.l +=7500;

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

088A B7 64

STA

$64

088C B6 63

LDA

$63

088E A9 1D

ADC

#$1D

0890 B7 63

STA

$63

0892 B7 16

STA

$16

ocmphi1 = q.b.hi;

0894 B6 13

LDA

$13

ac=tsr;

0896 B6 64

LDA

$64

ocmplo1 = q.b.lo;

0898 B7 17

STA

$17

089A 81

RTS

}

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

void TIMERCMP (void)

/* timer service module */

1FF6 08 9B

{

Freescale Semiconductor, Inc.

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