Try pulling portb.5 low (the lv programming pin)
Or disable low voltage programming.
----- Original Message -----
From: "Lucas Hartmann" <lhartmann@DETEC.UNIJUI.TCHE.BR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Monday, December 01, 2003 4:35 PM
Subject: [PIC]: Strange problem with PIC18F452 an HT-PICC18


Hello.

I'm having some trouble with the following code on PIC18F452. I try to run
it, but the IO pins aren't responding.

I double checked the power supply, the clock source (pic's clock output was
correct for the 40MHz osc), the pic itself, the programmer, the reset pin,
and everything seems correct. This takes me to a software problem.

I simulated the program using MPLAB and it worked. But, when running on the
real hardware the pic just does nothing.....

The code, Hi-Tech picc18:
********************************
#include <pic18.h>

#include "ceee.h"
#include "pbus.h"

void main() {
 GIE = 0;
 TRISD = 0x00;
 while(1) {
  PORTD = 0x00;
  asm("nop");
  asm("nop");
  PORTD = 0xff;
  asm("nop");
  asm("nop");
 }
}
***********************************
Configuration bits: WDT=off,  PUT=on, all code protections=off, oscilator
switch=off.

Am I forgetting something?

Lucas Hartmann

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