gnupic: PIC18E Extended Instruction Set
Subject:
Re: PIC18E Extended Instruction Set
From:
"George M. Gallant" ####@####.####
Date:
31 Dec 2004 02:28:55 +0000
Message-Id: <41D4B959.4070108@comcast.net>
Please read the errata before jumping on this device. Microchip seems to
have outdone itself
this time. The work-arounds regarding multi-word instructions and
interrupts leave much to
be desired.
George
Craig Franklin wrote:
> Vangelis Rokas wrote:
>
>> Please, don't mess with this just because I mentioned it. I don't
>> need support for Extended Instruction Set right away.
>
> Even if you don't need it, I am sure someone else will.
>
>> I was just wondering
>> whether I should begin adding support for it in pic16 port, or not,
>> in the
>> near future...
>>
>>
>>
>
> How much of documents you have read? Microchip refers to it as the
> "Extended Instruction Set". That is only one aspect of the change.
> When the config bit is set to enable the instructions, the behavior of
> some of the existing instructions (about half of them) is changed. So
> legacy code might not work. This will cause some headaches for gpsim.
>
> They have introduced a new assembler syntax for an offset, [
> expression ]. This syntax is only valid when this new extended mode
> of the assember is enabled. So gputils gets a few more special cases.
> Lovely.
>
> You are using a software stack for the sdcc pic16 target right? This
> new mode might make things a little easier for sdcc.
>
>> regards,
>> Vangelis
>>
>>
>>
>
>
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