internal oscillator block PIC18F2480

Guest · Posted: Fri Sep 22, 2006 7:20 pm

hello,
I am using a PIC18F2480. I'd like to use the internal oscillator @ 8MHZ. I can't seem to get it to oscillate. Any suggestions on the code? I'm confused about the proper #fuse to include. also the setup_oscillator function is kind of vague in the book.

Any help would be appreciated

Douglas Kennedy · Joined: 07 Sep 2003 Posts: 755 Location: Florida

Try this

skenn_ie · Joined: 16 Oct 2006 Posts: 1 Location: Ireland

I'm having a similar problem. Tried the code suggested, but still no clock.
How should this code appear in the "device configuration" bits of the programmer software ? I'm using an 18F2620, and WinPic

Eugeneo · Joined: 30 Aug 2005 Posts: 155 Location: Calgary, AB

Is there a setup directive built in to CCS for the osctune register? If not you're going to have to set the internal osc PLL bits somthing like this.

Ttelmah · Guest

It would help, first of all, if you said what compiler version?.
The 'setup_oscillator' call, should set the oscillator up correctly. It also should probably be unneccessary. The latter compilers, if the 'use delay' statement, is on the very next line after the fuses, will automatically set the oscillator up. However this should not matter, having the chip setup 'twice', should make no difference. I'd tend to 'err' to adding this as a safety feature. Smile

On Douglas's 'demo' code, how are you ever going to 'know' that the code as shown is working or not?. There is no output going to occur anywhere to actually test what is happening. Adding a pulse output in the while, would prove just what speed the chip is running.
One thing that would stop the chip waking up, would be if 'the MCLR line is not connected, and the 'NOMCLR' fuse has not been set. The chip will not start, till this pin goes high, unless the pin is disabled.

Best Wishes