I ordered some samples from freescale of various HC08s.  They shipped same
day, arrived today (2nd day) fedex.  I was very impressed with service so
far, but don't have any experience with motorola chips.  One question:

1.) Is there a de-facto preferred assembler (think mpasm) for these?  I've
so far been very unsuccessful locating anything of that quality.  The GCC
bin-utils is so far the top candidate I've found, but the command line
assembly can be a real PITA.

Thanks guys,

Robert B.

--------------------------------------------
Robert B.
email:  robertb@nerdulator.net


----- Original Message ----- 
From: "Olin Lathrop" <olin_piclist@embedinc.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Friday, November 12, 2004 3:02 PM
Subject: Re: [PIC:] Getting started with PIC's


> Wouter van Ooijen wrote:
> > One good reason: It is very difficult (I would say inpossible) in asm
> > libraries to use the few RAM locations in a PIC efficiently. Most asm
> > porograms simply assign a unique location to what is in effect a local
> > variable. A good HLL compiler will use a static-stack approach which
> > re-uses the RAM locations. Been there, tried that, wrote a compiler
> > instead.
>
> I get around this in a different way that in my opinion works very well.
> The vast majority of time, the only variables defined in the code are for
> persistant state.  I define a set of "general registers" in global (non
> banked) RAM when avaialable.  By default, subroutine are expected to
> preserve these except when they are explicitly returning values in them.
On
> subroutine entry, the general registers that the subroutine will trash are
> pushed onto a software stack, and then restored right before returning.
> These general registers are then used as local scratch inside the
> subroutine, which is useful since they are fast and usually
bank-independent
> to access.
>
> All this is made very easy by the the GLBSUB (GLoBal SUBroutine) and
> LEAVEREST (LEAVE and RESTore) macros in STD.INS.ASPIC at
> http://www.embedinc.com/pic.  The registers to save are listed once on the
> GLBSUB line, and the same set is automatically restored by LEAVEREST.  I
> have used this scheme over many PIC projects, and found it to be very
handy
> and efficient of RAM.
>
>
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