gnupic: PIC18E Extended Instruction Set
Subject:
Re: PIC18E Extended Instruction Set
From:
Craig Franklin ####@####.####
Date:
31 Dec 2004 03:32:16 +0000
Message-Id: <41D4C85E.6020101@users.sourceforge.net>
George M. Gallant wrote:
> 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.
>
I assume your comments are directed at me. I am the only TO on your list.
I am not using the device, only adding support for it in gputils. The
device is in production. The features being discussed are in the latest
version of Microchip's tools. So even though the devices have some
issues, gputils should fully support them.
Errors aren't unusual with new devices. Especially when device features
like this are added. The silicon will be revised and hopefully fixed.
> 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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