cant burn hex files on my PIC when I have USB232 connected

[B4rzan]

Whenever I have my USB232 connected to my laptop, I cant burn hex files on the PIC. The PPP programmer says the USB device is not detected even though the board is connected. It seems to me that both the USB232 and the EB006 board are using the same com port but I am not sure if this is the case. If it is to do with the com ports, I how do go about resolving it pls. following is a screenshot of the error:

[dazz]

Hi
The short answers is have the usb block disconnected when programming, to check if they are assigned different ports, got control panel, system, device manager, find the two boards in the com ports list and see if they have a different port number, if they have the same port say com6 right click the usb board entry ,select properties, and in one of the tabs theres an option to change the port number, change it to 7 or 8 as its unlikely(although it depends on how many different usb devices you have used) that something is already using that port. another thing to try is to completely uninstall the usb board driver from device manager, plug in your programmer board, then plug in your usb board, this should then assign a different port for the usb board

Regards
Dazz

[kalim007]

I can burn the program easily. When I connect input switch and output LED with EB006, everything works fine. I am interested to transfer the pic into breadboard and make my own circuit. I am getting real trouble here. I feel that pic microcontroller does not contain the program anymore. Can anybody help me here?

[Benj]

Whenever I have my USB232 connected to my laptop, I cant burn hex files on the PIC.

Which chip are you using? Both boards use completely different methods for USB so I am surprised there is a conflict.

I am interested to transfer the pic into breadboard and make my own circuit. I am getting real trouble here.

Ensure you supply the correct voltage to all the supply rails, pull up the MCLR pin using a 10K resistor. Maybe add a 10uF - 100uF electrolytic cap across the power rails. Check your oscillator and config settings match. The chip wont have lost the program there is simply something preventing it from powering up and running.

[kalim007]

I used +5V with 47k register in pin1. I am using 16F877A. When pic is in EB006, everything works. I am using 20 MHz crystal oscillator. I looked at some document and found I need two capacitor ~27pF. That's what I have used with crystal oscillator.

Correct me if I am wrong, input is active LOW in this microcontroller.

Thanks for your reply.