LTC2414IGN datasheet(43/48 Pages) LINER

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LTC2414/LTC2418

241418fa

// LTC2418 PIC16F84 Interface Example

// Written for CC5X Compiler

// Processor is PIC16F84 running at 10 MHz

#include <16f84.h>

#include <int16cxx.h>

#pragma origin = 0x4

#pragma config |= 0x3fff, WDTE=off,FOSC=HS

// global pin definitions:

#pragma bit rx_pin

@ PORTB.0

//input

#pragma bit tx_pin

@ PORTB.1

//output

#pragma bit sck

@ PORTB.2

//output

#pragma bit sdi

@ PORTB.3

//output

#pragma bit sdo

@ PORTB.4

//input

#pragma bit cs_bar

@ PORTB.5

//output

// Global Variables

uns8 result_3;

// Conversion result MS byte

uns8 result_2;

// ..

uns8 result_1;

// ..

uns8 result_0;

// Conversion result LS byte

void shiftbidir(char nextch);

// function prototype

void main( void)

{

INTCON=0b00000000;

// no interrupts

TRISA=0b00000000;

// all PORTA pins outputs

TRISB=0b00010001;

// according to definitions above

char channel;

// next channel to send

while(1)

{

/* channel bit fields are 7:6, 10 always; 5, EN; 4, SGL; 3, ODD/SIGN; 2:0, ADDR */

channel = 0b10101000;

// CH0,1 DIFF.

cs_bar=0;

// activate ADC

while(sdo==1)

// test for end of conversion

{

// wait if conversion is not complete

}

shiftbidir(channel);

// read ADC, send next channel

cs_bar = 1;

// deactivate ADC

/* At this point global variables result 3,2,1 contain the 24 bit conversion result. Variable result3

contains the corresponding channel information in the following fields:

bits 7:6, 00 always, 5, EN; 4, SGL; 3, ODD/SIGN; 2:0, ADDR */

}

// end of loop

}

// end of main

Figure 50. Sample Program in CC5X for PIC16F84

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