Trouble with 18f452 internal osc and RS232

[Joseph88]

Hello gurus,

I'm having trouble with my 18f452 on a picdem 2 board and rs232 communications. It will communicate properly if I have an EXTERNAL oscillator installed, but if I switch to the internal oscillator, the data received in the terminal is jibberish. Any help would be greatly appreciated.

Here is the code i'm using:

#include <18F452.h>

#fuses NOWDT,NOPROTECT,NOLVP
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, PARITY=N)
setup_oscillator(OSC_8MHZ);

void main() {

while(true){
printf("HELLO");
output_high(PIN_B3);
delay_ms(100);
output_low(PIN_B3);
}

}

[Mark Weir]

Hi,

I think you might ned to check the data sheet for this.

I don't think 18F452 has an internal osc.

Cheers

Mark

[Joseph88]

Hi Mark,

Thanks for replying. Yes you are right, the 18f452 doesn't have an internal oscillator. I got the answer from the other ccs board. My bad.

Joe