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Sorry my delay Alan, thank you for answering.

I had tried what you say to me, and I also got nothing. I had tried use the timer2 and timer3 too, I changed from external source to internal and noth ...

I'm trying to use Timer1 just to blink a LED, and I am using a dsPIC33EP64MC202 with a 12MHz crystal, clock is 140MHz. This is my header file:

#include <33EP64MC202.h>

#FUSES NOWDT ...

I would like to thank for your help Ttelmah and Jay. I found the problem in the code, #use fast_io (B) was making communication impossible. When I removed this line, everything worked correctly.

I have changed as Jay said by testing with the flag:

#include <18F4550.h> // including PIC library
#fuses XTPLL,USBDIV,CPUDIV1,VREGEN, MCLR, NODEBUG, PLL1, NOPUT
#device adc=10
#use d ...

I'm trying to use SPI communication inside of interrupt but it's not work well.

Code:

#include <18F4550.h> // including PIC library
#fuses XTPLL,USBDIV,CPUDIV1,VREGEN, MCLR, NODEBU ...

Hi guys, as you had told me about the hardware incompatibility betwenn PIC18F4550 and MAX11040. I had to change PIC to another device from Microchip too, I choosed to use MCP2210 that is a protocol co ...

Jay and PCM Programmer, thanks a lot for help me, I will fix all this problems. Now I can see more clearly what is happening. If it work or not I will post here the result.

No, I have supplied the peripheral correctly with 3 volts and the pic with 5.

I'm trying to use SPI with PIC18F4550 to communicate with ADC device MAX11040k, my compiler is PCW 4.140. Here is the data sheet:

#include <18f4550.h>
#device adc=10
#use delay(clock = ...