Thanks. I'll check that out.
Yep, I'm aware of TRIS being obsolete, but I was being sloppy since
I started with some sample code that used it.  I did get warnings, but
figured I'd feel like a pro if I already had some bad habits :-)

Actually I've never programmed PICs before.  Last thing I programmed
was an 8051 over 10 years ago, but most of my assembly was on a
Z80 (TRS-80 computer) about 20 years ago.  Ack!!!!

Cheers,
-Neil.



----- Original Message -----
From: "Olin Lathrop" <olin_piclist@EMBEDINC.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, February 28, 2002 6:34 AM
Subject: Re: [PIC]: Experimenting with F872 -- can't read from PORTA ???


> >>
>     movlw B'00111111'
>     movwf TRISA     ; Port A is all inputs
>     movlw B'00000110'
>     movwf ADCON1    ; Port A is all digital
>     movlw B'00000000'
>     movwf ADCON0    ; Turn off A/D
>     tris PORTB      ; Port B is all outputs
>     tris PORTC      ; Port C is all outputs
>
> loop:
>     movf PORTA,0    ; Grab data at port A
>     movwf PORTB     ; Dump to port B
>     goto loop
>
>     end
> <<
>
> For one thing, you've totally ignored bank settings.  You do need to pay
> attention to these.  Check out my DBANKIF and related macros if you want a
> more automatic way of setting the banks.  You can find them in
STD.INS.ASPIC
> at http://www.embedinc.com/pic.
>
> Secondly, don't use the TRIS instruction.  I'm surprised the assembler
> didn't give you a warning.  This is an old instruction that is (has) being
> obsoleted.  Note that it's not in the list of instructions on page 136 of
> DS30292C.
>
> It looks like you may have programmed some old chips a long time ago.
It's
> time to sit down and read the manual again for the chip you are using now.
>
>
> ********************************************************************
> Olin Lathrop, embedded systems consultant in Littleton Massachusetts
> (978) 742-9014, olin@embedinc.com, http://www.embedinc.com
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>
>

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