Rob Hamerling wrote:

>  I don't know and I
> don't really care if the JalV2 compiler uses new instructions like those
> of the 16f193x. It might be able to build more efficient programs if it
> does, but that is a different matter.

The enhanced 14 bit core parts (PIC19F193X) has two significant
changes. The ISA is a superset of the normal instruction set has
been mentioned in this thread. The second major difference is the
organization of the the processors memory map. This affects how
memory management is handled in code and how RAM should be
allocated by a compiler.

The memory organization changes makes it essentially impossible
to use existing HLL tools to support the parts.

The changes in the  memory maps are a big step in making the parts
more efficient for applications. RAM has effectively two addresses
one similar to the original 14 bit core and a second where the RAM
pieces are mapped into one long linear address.  Tools can optimize
how data is accessed knowing this relationship.



Regards,


w..
--
Walter Banks
Byte Craft Limited
http://www.bytecraft.com






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