MPXM2102AS datasheet(480/670 Pages) MOTOROLA

480 / 670 page

AN1536

3–334

Motorola Sensor Device Data

www.motorola.com/semiconductors

write()

{

char i;

digit[1]=10;

if (digit[2]==0)

{digit[2]=10;}

if (

digit[2]==10 && digit[3]==0 )

{digit[3]=10;}

for ( i=1; i<5; ++i )

{

if (i==4)

write_spi((lcdtab[digit[i]])+0x80);

else

write_spi(lcdtab[digit[i]]);

}

write_spi (2);

/* this creates a start bit and data bit 1

for the next write to the mc145453

}

write_spi( char a )

/* write a character to the spi port */

{

SPDR=a;

while ( ! ( SPSR & 0x80 ) ) {}

/* loop until the spif = 1 */

}

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

This function is called at power–up and will determine the operation

of the system. The user must complete the system configuration prior

to setting the jumper in the first or last two configurations in the

table or erroneous operation is guaranteed!

test/operation jumper configuration:

1 = jumper removed

display speed in mph

reserved

30 psi xdcr installed

15 psi xdcr installed

full scale calibrate

zero calibrate

display pressure in psi

display speed in mph

setconfig()

{

char i;

for ( i=0; i<125; ++i )

delay();

/* to let the charge pump come to life wll */

i = PORTC & 0x07;

/* and off the unused bits */

if ( i == 7 )

display_speed();

if ( i == 6 )

setup_error();

/* non–valid pattern output –SE– on display*/

if ( i == 5 )

{write_eeprom(30,&XDCRMAX); /* xdcr is 30 psi */

display(30);

}

if ( i == 4 )

{write_eeprom(15,&XDCRMAX); /* xdcr is 15 psi */

display(15);

}

if ( i == 3 )

fullscale_calibrate();

if ( i == 2 )

zero_calibrate();

if ( i == 1 )

display_pressure();

else

display_speed();

}

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

display(char d)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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