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PIC 18F87J50 and OSCTUNE register for USB settings [solved]

 
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rvalor



Joined: 16 Apr 2009
Posts: 18
Location: Spain

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PIC 18F87J50 and OSCTUNE register for USB settings [solved]
PostPosted: Fri Dec 04, 2009 4:22 am     Reply with quote
Hello everybody¡¡

I'm working with the 18F66J50 and the 18F87J50 PIC micros.

I'm trying to configure the USB at 48MHz and I've done this:

I use 8Mhz crystal ------> I need to convert it to 4MHz so ---> #FUSES HS and #FUSES PLL2...

and I seen on this forum I need to manually set on the 96MHz PLL because this isn't done automatically (PIC18f4550 did it), so I used this code:
Code:

//Define a variable in the right place...
#BYTE OSCTUNE = 0xF9B
#BIT OSCTUNE_PLLEN = 0xF9B.6

//and in main() while initializing I done:

//OSCTUNE_PLLEN = 1;    // Enable PLL

But while debugging the value of the OSCTUNE register doesn't change...
I'm very confused and I need to use the USB pheripheral...

Can somebody help me???

Thank you in advance.
rvalor



Joined: 16 Apr 2009
Posts: 18
Location: Spain

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Problem solved¡¡¡
PostPosted: Fri Dec 04, 2009 4:40 am     Reply with quote
Hello everybody,

I've solved the problem:

The correct fuse to configure the PLL is the
Code:
#FUSE H4_SW         //High speed osc with SW enabled 4x PLL

then
Code:
#FUSES PLL2                     //Divide By 2(8MHz oscillator input)

and in main() now I can pull-up the PLLEN bit.

Doing this, the PIC has been recognized by the PC inmediately.
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