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18F25k22 high speed baud problem

 
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kmp84



Joined: 02 Feb 2010
Posts: 354

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18F25k22 high speed baud problem
PostPosted: Fri Jan 24, 2014 3:20 am     Reply with quote
Hi all developers,
I have problem with baud rate on PIC18F25k22 for speed above 19200 bps.

My compiler ver. 4.140
Code:

   #include <18F25k22.h>
   #fuses HSH,PLLEN,CPB,EBTRB,PROTECT,NOFCMEN,PUT,MCLR
   #use delay(clock=64000000) //64 MHz = f.osc(16mhz).x4 (PLL)
   #use rs232(baud=115200,xmit=PIN_C6,rcv=PIN_C7,errors)
   
   void main(void){
     
      setup_oscillator(OSC_PLL_ON);
      delay_ms(300);
      printf("\n\rTEST Print on HW_USART.....");
     
      for(;;)
      {
         
      }
   }


Thanks for your interest about my problem!
Ttelmah



Joined: 11 Mar 2010
Posts: 19537

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PostPosted: Fri Jan 24, 2014 3:25 am     Reply with quote
Have a look at this thread:

<http://www.ccsinfo.com/forum/viewtopic.php?t=51769>

However there have also been several reports of baud rate problems when the CPU clock is this high, that are not documented in the errata (yet...). There is a bug with several other chips when the clock is this fast, and some of these chips seem to show the same problem...

Best Wishes
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