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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Thu Nov 09, 2006 3:25 pm |
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Here is a test program for the 18F4550 that runs off the internal
oscillator at 8 MHz. I tested this with PCH vs. 3.249 on a PicDem2-Plus
board.
| Code: |
#include <18F4550.h>
#fuses INTRC_IO, NOWDT, PUT ,BROWNOUT, NOLVP
#use delay(clock=8000000)
//============================
void main()
{
while(1)
{
output_high(PIN_B0);
delay_ms(500);
output_low(PIN_B0);
delay_ms(500);
}
} |
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Ttelmah
Guest
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| Posted: Thu Nov 09, 2006 3:31 pm |
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Without knowing what type of oscillator you want to use, it'll be a guess. HS, _requires_ an external crystal. If you do not have one, get rid of it. INTRC, implies operation with the internal oscillator.
#FUSES INTRC, NOPROTECT, NOLVP, NOBROWNOUT, NOWDT, NOMCLR, NOPUT
#use delay(clock=8000000)
Should normally give you 8MHz. However on some compilers, you may need to have the line:
setup_oscillator(OSC_8MHZ);
Near the start of the main (the compiler should generate this internally, automatically if the correct 'delay' statement is present, but it is safer to include it yourself).
Best Wishes |
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