MPXM2102AS datasheet(479/670 Pages) MOTOROLA

479 / 670 page

AN1536

3–333

Motorola Sensor Device Data

www.motorola.com/semiconductors

{

digit[i] = 0;

/* put blanks in all digit positions */

}

for ( i=0; i < 4; ++i )

{

if ( arg

>= dectable [i] )

{

digit[i] = arg /dectable[i];

arg = arg–(digit[i] * dectable[i]);

}

digit[i] = arg;

}

/* ################################################################### */

delay()

{

int i;

for (i=0; i<1000; ++i); /* delay about 15 ms. @ 8 mhz xtal */

}

/* ################################################################### */

/* set–up i/o for the single slope a/d, initialize the spi port, then

initialize the MC145453 for output */

init_io(void)

{

char i;

/* set–up i/o for the a/d */

PACTL |= 0X80;

/* make pa7 an output */

PORTA |= 0X80;

/* turn the fet on */

PORTB &= 0X7F;

/* set–up the HC4053 in the Y0/Z0 connect mode */

TCTL2 = 0X2A;

/* capture on falling edge for timer capture 0,1,2 */

TFLG1 = 0X07;

/* clear any pending capture flags */

/* set–up the i/o for the spi subsystem */

PORTD=0x2f;

/* set output low before setting the direction register */

DDRD=0x38;

/* ss = 1, sck = 1, mosi = 1 */

SPCR=0x51;

/* enable spi, make the cpu the master, E clock /4

/* initialize the lcd driver */

for (i=0; i<4; ++i)

/* four bytes of zeros */

{

write_spi(0);

}

write_spi (2);

/* this creates a start bit and data bit 1

for the next write to the mc145453 */

}

/* ################################################################### */

/* this is an attempt at the newton square root method */

sqrt(unsigned long b)

{

unsigned long x0,x1;

if ( b < 4 ) { b=2; return (b); }

else

x0=4;

x1=10;

while (x0 != x1)

{

if( (x1–x0) ==1 ) break;

x1=x0;

x0=(( (b/x0) +x0 ) >> 1 );

}

b=x0;

return (b);

}

/* ################################################################### */

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MPXM2102AS Datasheet(PDF) 479 Page - Motorola, Inc

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