5 Yorum “Pic, Atmel, 8051 ÇeÅŸitli Mikrodenetleyici Devreleri”

1. kaci Tem 15, 2008

   hi,
   i need some help for progamming pic 18f 458 (adc,clr ,quartz),
   thanks

2. admin Tem 15, 2008

   what kind of help

3. kaci Tem 22, 2008

   yes,i work with the compilateur ccs

   1.i want the pic18f458 opperates at 40 MHz.what i have to do.

   2.i have 3 analog input (3phase)(3 sinusoide)(ampli 2.5v),

   the adc conversion will be 10bit (5volt;correspond;1024) or

   8bit(5volt;correspond;256)

   what’s the manner to program this

4. Binu Tem 25, 2008

   Good collection of projects.

5. kaci Eyl 2, 2008

   hi all,
   in need some hope(oriontatin) in my application.
   my application consist in;
   i have 3 analog input (3 sinusoidal tensions),then i neeed a/d converter
   an0,an1,an3 (10bit conversion) and the 3 result of conversion will be used in calcul(var =fonction(read(1),read(2),read(3…) fonction is(arctan..) )
   i use the pic 18f458(with picc compiler) and i want to obtain a hightspeed intern (40MHZ)
   ,for this i have used 10MHZ with pll enabled

   my progam;
   #include
   #device adc=10
   #fuses hs, NOWDT, NOPROTECT, PUT, BROWNOUT, NOLVP
   #use delay (clock=40000000)
   double result;
   float v1,v2,v3;

   void main(void)
   {
   ld:
   setup_adc_ports(ALL_ANALOG);
   setup_adc(ADC_CLOCK_DIV_32); // utilisation de l’horloge interne pour l’ADC
   set_adc_channel(0); // Lecture sur le canal 0 du port
   result=(double)(read_adc());
   v1 = ( 5.0 * result ) / 1024;
   set_adc_channel(1); // Lecture sur le canal 1 du portA
   delay_us(10);
   result=(double)(read_adc());
   v2 = (5.01 * result) / 1024;
   delay_us(10);
   result=(double)(read_adc());
   v3 = (5.01 * result) / 1024;
   goto ld;
   }

   my questions;
   1.how much time to the ad convertion (convert 3analog input to digital)
   2.what is the faster a/d convertion 8bit or 10bit.and how much for difference.
   3.what the declaration can i use to obtain max internal execution speed (40Mhz)(i use 10MHZ with pll enabled)
   (1).#fuses hs, NOWDT, NOPROTECT, PUT, BROWNOUT, NOLVP
   #use delay (clock=40000000)

   or:
   (2).#fuses hs, NOWDT, NOPROTECT, PUT, BROWNOUT, NOLVP
   #use delay (clock=10000000)
   4.is it necessary to do delay time; (delay_us(10);)