Post by thread:[AVR]: 15L datasheet and instruction set frustrati

Hi Listfolks, I'm new on the [AVR] list, and I haven't been able to find anything about this on-line, so please forgive me (and point me to some help) if this has become a tiresome topic. I can't imagine I am alone with this problem! I am wrapping up a design based on the ATtiny15L. I am absolutely at the end of my rope on the LOUSY documentation ATMEL provides for this processor. I just burned up about 15 hours discovering that 'st Z+, Rd' is not a legal instruction, although it will compile and simulate just fine on ATMEL's development system (ya gotta 'st Z, Rd', then 'inc ZL'). Further, if you look at the part-specific instructions on the HTML help files, the 'st' and 'ld' instructions give examples using the X pointer, not the Z pointer. As far as I can tell, there is no X or Y pointer on the 15L. There is only 2 times that the phrase 'Z pointer' comes up in the data sheet. AAAAAAARRRRRRRRRRRRGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHH! Does anyone know where I can get an _accurate_ instruction set reference for the 15L? Thanks, Lyle ____________________________________________ Lyle Killough spam_OUTlyleTakeThisOuTsuregripcontrols.com ____________________________________________ Sure Grip Controls Inc. 4 - 1413 McGill Road Kamloops, BC, V2C 6K7 Canada phone 250-374-2278 fax 250-374-1099 ____________________________________________ http://www.suregripcontrols.com ____________________________________________ -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

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 BTW the data sheet I used to check the atiny15L instruction set was downloaded from: http://www.atmel.com/atmel/acrobat/doc1187.pdf And the version of avrstudio I'm using is 3.51. regards, carl At 11:31 AM 2/16/2002, you wrote: {Quote hidden}>Hi Listfolks, > >I'm new on the [AVR] list, and I haven't been able to find anything >about this on-line, so please forgive me (and point me to some help) if >this has become a tiresome topic. I can't imagine I am alone with this >problem! > >I am wrapping up a design based on the ATtiny15L. I am absolutely at >the end of my rope on the LOUSY documentation ATMEL provides for this >processor. > >I just burned up about 15 hours discovering that 'st Z+, Rd' is not a >legal instruction, although it will compile and simulate just fine on >ATMEL's development system (ya gotta 'st Z, Rd', then 'inc ZL'). >Further, if you look at the part-specific instructions on the HTML help >files, the 'st' and 'ld' instructions give examples using the X pointer, >not the Z pointer. As far as I can tell, there is no X or Y pointer on >the 15L. There is only 2 times that the phrase 'Z pointer' comes up in >the data sheet. AAAAAAARRRRRRRRRRRRGGGGGGGGGGGGGGGGHHHHHHHHHHHHHHHH! > >Does anyone know where I can get an _accurate_ instruction set reference >for the 15L? > >Thanks, Lyle > > > >____________________________________________ > >Lyle Killough .....lyleKILLspam@spam@suregripcontrols.com >____________________________________________ > > Sure Grip Controls Inc. > 4 - 1413 McGill Road > Kamloops, BC, V2C 6K7 > Canada > > phone 250-374-2278 > fax 250-374-1099 > >____________________________________________ > > http://www.suregripcontrols.com >____________________________________________ carl -------------------------------------------------------- Henry Carl Ott N2RVQ carlottKILLspamsi.rr.com http://users.rcn.com/carlott/ -------------------------------------------------------- Non calor sed umor est qui nobis incommodat. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

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 removed}