PIC18F4620 LED BLINKING WORKING IN DEBUGGING BUT NOT AFTER FLASHING

[muthukural001]

Hello All,

Just to ensure that Microcontroller is working fine, I am trying to blink LED . Blinking is happening in Debug mode but After flashing the code nothing coming.



Please suggest..


Regards,
'Muthu

[IonizedGears]

Not sure if this is your issue but I have a pickit4 and I was experiencing an issue that no matter what I did I could not get a single led to flash on a PIC18f46k22 no matter what I did. After hours of reading through the datasheet and looking online I found out by accident that it started working after I disconnected the pickit4 completely from the circuit. It would stop working as soon as I would reconnect the pickit4. Maybe you are having the same issue? Also, as a shameless hijack, does anyone know why I was getting this issue?

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[Ian.M]

IIRC the debug executive on older PIC18 parts sets the whole of Port B to digital mode.   If your LED is on a Port B pin and you aren't using the LATB register to flash it, that's probably the difference.   Otherwise, as IonizedGears suggests, totally disconnect the programmer after flashing your release build, and add a 10K pullup resistor from /MCLR to Vdd.

[zzattack]

Better upload some code/schematics. Likely issue is floating VPP in combination with MCLR config bit set.

[muthukural001]

Hello All,

Thanks. The problem was not pulling up MCLR pin to VCC. After did this, I was able to flash My MCU.




Thanks,
Muthu