Hi Norm,

The Warning Message is saying it all.  The warning is telling you that you
are using an unitialized Register.

Unfortunately, MPSIM will show all your registers as having "00" (except for
Registers which are initialized on Power Up), so it makes it hard to find.
In reality, RAM Registers actually power up to some non-zero value.

If you have an interrupt handler, check your code for context switching, you
may be experiencing an interrupt before all the registers that are saved are
setup.  In this case, you are saving something that hasn't be setup (which
really isn't an error).

The only way of finding it using MPSIM that I can recommend is running your
program (and varying your stimulus) until you can make the message come up
reliably.  Once you do that, go through your code, jumping over your
subroutines (ie putting a breakpoint at the instruction after the
subroutine) until you can narrow it.

In the simulator, I just waxed poetic on, I do a hard stop during execution
in just such a case because I consider this to be a potentially big problem.

Good Luck!

Myke


>The listserver rejected my first post so I am re posting.  I found the problem
>area but still want to know if the capability exists.
>
>I am testing some software using mpsim.  I get the warning "Caution - register
>file read before write"  I have eliminated most of them but am having trouble
>finding one.  Is there a way to get mpsim to break at the instruction causing
>this warning?  I know I could probably find it with enough looking thru the
>code but if the tool can help, I'll let it.  BTW this one must be in a
>infrequently executed segment since it occurs infrequently.
>
>Thanks for any help.
>
>Norm
>
>
Myke

"We're Starfleet officers, weird is part of the job."

Capt. Catherine Janeway