33991 datasheet(33/36 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33991

TIMING DESCRIPTIONS AND DIAGRAMS

SAMPLE CODE

/* Step 15 */

Command_Gauge(0x10,0x00);

/* Null Read to get status */

/* Check SO bit ST4 to see if Gauge 0 has moved */

If((status & 0x10) != 0)

/* If it has moved, then keep track of position */

/* Wait until 24 steps are finished then send a RTZ command (Step 17) */

/* Step 16 */

Command_Gauge(0x80,0x02);

/* Send RTZ to Gauge 0 */

/* Step 17 */

Command_Gauge(0x10,0x00);

/* Null Read to get status */

/* Read Status until RTZ is done */

While ((status & 0x04) != 0)

{Command_Gauge(0x10,0x00);}

/* Step 18 */

Command_Gauge(0x80,0x03);

/* Send RTZ to Gauge 1 */

/* Step 19 */

Command_Gauge(0x10,0x00);

/* Null Read to get status */

/* Read Status until RTZ is done */

While ((status & 0x08) != 0)

{Command_Gauge(0x01,0x00);}

/* Step 20 */

Command_Gauge(0x00,0x00);

/* Disable Gauges and go into Standby */

/* Put device to sleep by setting RSTB to logic 0 */

}void Command_Gauge(char MSB, char LSB)

/*This subroutine sends the GDIC commands on the SPI port */

{

PORTS = 0x00;

/* Chip select low (active) */

SP0DR = MSB;

/* send first byte of gauge command */

While ((SP0SR & 0x80) == 0);

/* wait for Rxflag (first byte) */

RTZdata = SP0DR;

/* Read status MSB */

SP0DR = LSB;

/* send second byte of command */

While ((SP0SR & 0x80) == 0);

/* wait for Rxflag (second byte) */

status = SP0DR;

/* read status LSB */

PORTS = 0x04;

/* Chip select high (deactivated) */

}

/* Motorola Semiconductor Products Sector */

/* October 4, 2002 */

33991 Datasheet(PDF) 33 Page - Freescale Semiconductor, Inc

33991 Datasheet(HTML) 33 Page - Freescale Semiconductor, Inc

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