Hello,

Thanks for the given input! I made a MPLAB project and added the assembler
file to it. The code compiles when renaming the config to con_fig, but no
include files are used...

The control registers are defined in the program start:

*;Variable definition - PIC16C84 control registers.*

*f0      equ     00
rtcc    equ     01
pc      equ     02
status  equ     03
carry   equ    0
zbit    equ    2
rp0     equ    5
rp1     equ    6
fsr     equ     04
porta   equ     05
portb   equ     06
eedata  equ     08
eeadr   equ     09
eecon1  equ     08
rd      equ    0
wr      equ    1
wren    equ    2
eecon2  equ     09
pclath  equ     0A
intcon  equ     0B
f       equ    1
w       equ*    0

And they are used in the program... also some 'magical' numbers are used
within the code to set the registers:

*;Init sets porta as all outputs, pin b0 as input and the rest of portb as
;outputs and sets the rtcc counter to divide by 32 (16us at 8MHz clock).
;FSR is set to 88h for indirect access to INTCON register from page 00.*

*Init    movlw   b'00000001'     ;RA0=input, RA1,2=outputs
        tris    porta
        clrf    porta
        movlw   0x00            ;All of PortB = outputs
        tris    portb
        clrf    portb
        clrf    intcon
        movlw   0x84
        option
        movlw   0x88
        movwf   fsr*

Luckily the code is well documented... but I might have to do some puzzling
then :)

Best regards,

Jan



2007/4/2, Herbert Graf <mailinglist3@farcite.net>:
>
> On Mon, 2007-04-02 at 21:11 +0100, Steve Smith wrote:
> > Well if you replace all the labels 'config' with con_fig it compiles for
> a
> > 628 in mp lab but I haven't looked at the functional differences between
> the
> > parts shouldn't be too bad
>
> Hello Steve,
>
> There are a few issues you must look in to.
>
> First off, yes, you have to "translate" the config settings to the 628.
> Generally the 628 has "more" stuff in the config section, so you must
> turn off the things that the 16F84 doesn't have that may interfere with
> operation.
>
> Second, the analog comparators in the 628 have to be turned off, by
> default they are on.
>
> Third, and this is the one that either is zero work or TONS of work: you
> have to look at how the assembly is written. If the writers used the
> MChip include files, and did proper work with the bank settings (i.e.
> using BANKSEL) you should be OK. However, if they defined their own
> symbols for FSRs, or, even worse, used the numeric values you have ALOT
> of work ahead of you.
>
> Same with general RAM, if they did things proper you should be fine, if
> they used "defines" with absolute numbers then you may have alot of work
> ahead of you.
>
> Good luck!
>
> TTYL
>
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