Hello and thanks always
I would appreciate your help on a problem I have
I have succesfully programmed a board containing a PIC18F2553 with 20MHz crystal and 22pF capacitors in it
now I am trying to do the same with a PIC 18F2550 but this time I will be building my board.
First trying it on a breadboard I am using a 24MHz crystal
http://pdf1.alldatasheet.com/datasheet-pdf/view/70113/KSS/HC-49U-S.html
with either 18pF or 20pF capacitors.
I of course, according to the datasheet changed the PLLDIV settings from 5 (for 20MHz) to 6 (24MHz) so that the PLL part gets the required 4MHz.
The thing is that the PC does not recognize this as a USB device. First it was recognized as an "unknown device"
Now it doesnt even recognize there is something attached to it...
At first I thought maybe the crystal in the breadboard was not working well, but I programmed a non-USB program in the pIC and it worked well (although much faster than my previous internal oscillator experience)
Any possible help on this will be greatly appreciated.
I would appreciate your help on a problem I have
I have succesfully programmed a board containing a PIC18F2553 with 20MHz crystal and 22pF capacitors in it
now I am trying to do the same with a PIC 18F2550 but this time I will be building my board.
First trying it on a breadboard I am using a 24MHz crystal
http://pdf1.alldatasheet.com/datasheet-pdf/view/70113/KSS/HC-49U-S.html
with either 18pF or 20pF capacitors.
I of course, according to the datasheet changed the PLLDIV settings from 5 (for 20MHz) to 6 (24MHz) so that the PLL part gets the required 4MHz.
The thing is that the PC does not recognize this as a USB device. First it was recognized as an "unknown device"
Now it doesnt even recognize there is something attached to it...
At first I thought maybe the crystal in the breadboard was not working well, but I programmed a non-USB program in the pIC and it worked well (although much faster than my previous internal oscillator experience)
Any possible help on this will be greatly appreciated.