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EX_ADMM10.C example

 
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art



Joined: 21 May 2015
Posts: 181

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EX_ADMM10.C example
PostPosted: Wed Jan 15, 2020 2:50 am     Reply with quote

Hi,

I would like to know, what does " #device ADC=16 " mean ?
In EX_ADMM10.C example it shows that for PCM and PCH, both use this setting. Is it referring to 16 Bit ADC ? if YES, does it mean that PIC18F452 can be set as 16bit ADC ? Follow to datasheet , this PIC18 is a 10 bit ADC.

Code:

#if defined(__PCM__)
#include <16F877.h>
#device ADC=16
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#elif defined(__PCH__)
#include <18F452.h>
#device ADC=16
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#elif defined(__PCD__)
#include <30F2010.h>
#device ADC=16
#fuses HS,NOWDT,NOPROTECT
#use delay(clock=20000000)
#use rs232(baud=9600, UART1A)
#endif


Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Wed Jan 15, 2020 2:58 am     Reply with quote

It tells the compiler ADC functions to justify the ADC results out to 16bits.
The ten bit adc result, is moved so that instead of receiving:

0b000000xxxxxxxxxx

You receive:

0bxxxxxxxxxx000000

With the top bit of the physical result in the 16th bit of the return.
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