Help with 18F2520

[mister_e]

No or partially... you forget the internal comparator, but Ra1 will be digital in deed if the comparator is turn off... not AN0

CMCON and ADCON1 only to disable all analog stuff, use ADCON0 only if you want to play really safe.

Not much... you'll discover everything in the... datasheet. it's free to download and really usefull
http://ww1.microchip.com/downloads/e...Doc/39631a.pdf

[BertMan]

Thanks for the replies. I didnt have to do this with the 628A, so I just expected it to work on the 18f2520 (which is 32k code not 16k..oops). I have been reading the datasheet for a week now and it has info on ADCON, ANSEL, CMCON, etc, but not how and where to use it. Nothing in the Picbasic help about it either.

So to change these registers, I need to identify them and add them to the top of my pic basic code like TRIS? Can I do this with any register I want to alter? Or is there only a few that Picbasic recognizes?

[CocaColaKid]

I believe PBP will allow you to change virtually any register that is applicable for the MCU you've chosen.

[BertMan]

Thanks for all your help Cokehead and Mr E! I will give this a try this evening and let you know what happens.

[BertMan]

Hmm... Same thing. I put this at the top: ADCON1 = %00001111
CMCON = %00000111 and same character over and over. Could it be possible that I need to use a line driver?

[Darrel Taylor]

<bgsound src="http://www.darreltaylor.com/files/woohoo2.wav" loop="false">BertMan,

It may have just been a typo, but in your first post you had this line ...

define OSC = 8

It shouldn't have an equal sign in there, and PBP won't complain if it's wrong. But it may be thinking it's running at a different frequency.
<br>

[BertMan]

Just for grins I adjusted the baud rate in hyperterminal to see if I could get any different results, and found something very interesting. At 300 baud it works! I set the baud rate to 2400 as it is defined in pbp, and nothing.

[BertMan]

Thanks Darrel, it was a typo.