PIC18F87J60 with HSPLL don't work

[hevemarc]

I am using a 25Mhz crystal in my project, but this doesn't work when I use #fuse HSPLL. The microcontroller is slow, almost stopping... is there something more for me to configure?

This is my code:

[Ttelmah]

Think about it for a moment. The PLL, requires configuration of the prescaler, and postscaler. The compiler can do this for you, but _only_ if you give it the information it needs. Nowhere are you telling it that your crystal is 25MHz, so how is it meant tot configure these settings?. Guesswork?.

Best Wishes

[hevemarc]

I already tried to use the directive #use delay(oscillator=25Mhz, clock=41666667Mhz), but continued of the same mode...

I don't know how I give the information of prescaler and postscaler for the compiler...
I also already tried to use the directive #use dalay(clock=25MHZ) and to use #fuse HS for work as default, but not worked.

it should be lacking some information yes...
I don't only know which...

best regards

[Ttelmah]

OK. Now you have told us you are giving the compiler some information, obvious question 'what compiler version'?.

Best Wishes

[hevemarc]

I'm using a CCS compiler version 4.110

Now I am trying to use those commands to change the registers:

[Ttelmah]

Puzzled now, since HSPLL, is _not_ a valid fuse for the 18J90, with 4.110. Since you were using this, I was assuming you had a very old compiler.
What you posted should not even compile with 4.110

A quick test, loading your posted code, removing HSPLL, and setting crystal=25000000, compiling, and transferring to MPLAB, shows the PLL being correctly set in this version, but the fuses selecting 'EC', not HS by default, so the oscillator won't be starting at all, and the chip will be falling 'back' to the failsafe oscillator.
Selecting:

[Wayne_]

I am using the 97J60 and the following produces the required result:-

[Ttelmah]

Interesting. With 4.110?.
The point is that simply setting the crystal and clock (which does work for many other chips), seems to select the wrong oscillator on the 87J60/4.110. As I said, I found that this gave EC+PLL, which requires an external oscillator, not a crystal. Changing to H4_SW, selected the HS+PLL option as required.

Best Wishes

[Wayne_]

Changing the fuse HS or H4_SW does alter the fuses settings in the .lst file but does not change the frequency at which it is running.

Using crystal= or osc= makes no difference to the fuse settings.

#use delay(crystal=25Mhz, clock=41.6667Mhz) Pic runs at 41.6667MHz

#use delay(clock=25Mhz) Pic runs at 25MHz

On actual hardware.

Compiler = 4.114

[bkamen]

I've been playing with my 97J60 for something else recently...

on PCH 4.114 (my version)

I've been doing:

#fuses H4_SW // remember, the j60 is a software enabled PLL.
#use delay (clock=41.667M, crystal=25M)


and then in main()

setup_oscillator(OSC_PLL_5_DIV_3);


Let me know if that helps.

Cheers,

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

[Ttelmah]

Big difference, 4.114, not 4.110.
As I said, loading the file into MPLAB, shows that on 4.110, the compiler the poster is using, if you don't select H4_SW, the oscillator is set to EC, which won't run without an external oscillator. Also, behoves the question, do you have a crystal, or an oscillator module?. This wouldn't care....

Best Wishes

[bkamen]

[Ttelmah]

I was replying to Wayne, not you. The old 'takes time to post' syndrome.....

Best Wishes

[bkamen]