Texas Instruments MSC1210 - Manual (Page 159)

Syncronizing Multiple MSC1210 Devices
12-23
Analog-to-Digital Converter
#include <REG1210.H>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define LSB 298.0232e−9 /* LSB=5.0/2^24 */
extern void autobaud(void);
extern long bipolar(void);
void main(void)
{
float volts, temp, resistance, ratio, lr, ave;
int i, k, decimation = 1728, samples;
autobaud();
printf(”MSC1210 Sync Example \n”);
//Timer Setup
USEC = 10; // 11MHz Clock
ACLK = 9; // ACLK = 11,0592,000/10 = 1,105,920 Hz
// modclock = 1,105,920/64 = 17,280 Hz
// Setup ADC
PDCON &= 0x0f7; // turn on adc
ADMUX = 0x01; // Select AIN0/AIN1
ADCON0 = 0x30; // Vref On, Vref Hi, Buff off, BOD off, PGA=1
ADCON2 = decimation & 0xFF; // LSB of decimation
ADCON3 =(decimation>>8) & 0x07; // MSB of decimation
ADCON1 = 0x01; // bipolar, auto, self calibration, offset, gain
while(sync == 0); // As long as sync is low, wait
// Now that sync is low, shut down ADC.
PDCON |= 0x08;
while(sync == 1); // As long as Sync is high, wait.
// When sync goes low, turn on ADC and continue
PDCON = ~0x08;
// At this point ADC is on and multiple MSC1210’s using the
// same Sync signal will be in syncronization.
} //main