Thanks for the feedback Carl.

I also agree that the instruction set summary at the end of the 15L data
sheet excludes X and Y, but if you look under the Help file of AVR
Studio, (I'm using 3.52), under the _device-specific_ instruction set
for the ATtiny15L, there is no mention or example of the Z pointer for
LD or ST, but it does cover LD/ST X/X+/-X, which is clearly an error.  I
erroneously believed that the device-specific instruction set in the
help file is truly device-specific.   (I'd love to be able to print the
instruction set, not just the summary, so I can scribble all over the
things that are not true.)

All of the moaning aside, this is the core of a new product line, and
there will be other issues down the road.  I am still looking for
reliable reference material on the ATtiny processor family.  Anyone know
of any books?

Lyle



> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of H. Carl Ott
> Sent: February 16, 2002 12:39 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [AVR]: 15L datasheet and instruction set frustration
>
>
> Hi Lyle,
>   First off, I've never done anything with the 15L.
>
> The 15L complete data sheet downloaded from the atmel web
> site, clearly shows that there are no x or y pointers. And
> the instruction set summery at the end of the data sheet does
> not show any z+ instruction.
>
>   The generic instruction set that is part of the assembler
> documentation shows the instruction set for the entire AVR
> processor family. And yes I've been bit by trying to use an
> instruction that was not implemented on the particular
> processor I was using. But it should generate an error.
>
>   There does appear to be an error in the assembler regarding  the 15l
>   A couple of quick tests with the following test code.
>
> .device ATtiny15
> .CSEG
>          st      z+,r16
>
> does not generate an unsupported command error
>
> If we change the device to ATiny11 or 12, it does generate an
> error ATiny28 does not generate an error.
>
> Something is wrong here.
>
>   Not too much help, but I might also suggest the forums over
> at avrfreaks for additional on-line help and support.
> http://www.avrfreaks.com
>

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