Post by thread:MPLAB not MPASM

I reread my message about MPASM. It is MPLAB that I am referring to and it is the simulator that is giving me problems. Also the PC stays at 01FF not FF. I am using the 12C508 for the processor. I am trying to debug a program by stepping through it using the simulator. Like I said changing the input on pin GP3 to 0 using the Modify dialog box or simulator stimulus file make the simulator stay at the 01FF address. I am having the problem no matter what .asm file I use. -- David

David Sprenkle <spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU> wrote: > I am using the 12C508 for the processor. > > I am trying to debug a program by stepping through it using the > simulator. Like I said changing the input on pin GP3 to 0 using the > Modify dialog box or simulator stimulus file make the simulator stay > at the 01FF address. David: The 12C508's pin 4 serves a dual-purpose; it can be configured as either GP3 (as you desire) or MCLR. It sounds as though you've configured it as MCLR; check the chip configuration and make sure that MCLR is disabled. -Andy === Andrew Warren - .....fastfwdKILLspam@spam@ix.netcom.com === Fast Forward Engineering - Vista, California === http://www.geocities.com/SiliconValley/2499

Thank you for the help, that was the problem. MPLAB does not prompt you for the chip setup like if does when you program them. Thanks again, took a nap and woke up to solution to my frustrations. Andrew Warren wrote: {Quote hidden}> David Sprenkle <PICLISTKILLspamMITVMA.MIT.EDU> wrote: > > > I am using the 12C508 for the processor. > > > > I am trying to debug a program by stepping through it using the > > simulator. Like I said changing the input on pin GP3 to 0 using the > > Modify dialog box or simulator stimulus file make the simulator stay > > at the 01FF address. > > David: > > The 12C508's pin 4 serves a dual-purpose; it can be configured as > either GP3 (as you desire) or MCLR. > > It sounds as though you've configured it as MCLR; check the chip > configuration and make sure that MCLR is disabled. > > -Andy > > === Andrew Warren - .....fastfwdKILLspam.....ix.netcom.com > === Fast Forward Engineering - Vista, California > === http://www.geocities.com/SiliconValley/2499 --

David, you need to disable MCLR in the configuration word. GP3 is shared with MCLR and it sounds like the simulator is assuming MCLR is enabled and is holding the PC at 1FFh where it would normally do a MOVLW xx where xx is the OSCCAL value. - Tom At 05:43 PM 2/14/98 -0800, you wrote: {Quote hidden}>I reread my message about MPASM. It is MPLAB that I am referring to and >it is the simulator that is giving me problems. Also the PC stays at >01FF not FF. > >I am using the 12C508 for the processor. > >I am trying to debug a program by stepping through it using the >simulator. Like I said changing the input on pin GP3 to 0 using the >Modify dialog box or simulator stimulus file make the simulator stay at >the 01FF address. > >I am having the problem no matter what .asm file I use. >-- >David > >

David, I had the same problem with mplab 3.30 about a month ago. Even when I was sure that the internal MCLR was enabled, simulating with a 0 on GP3 would put it in reset. ( I assumed it was reset as PC = 1FF as you say) Since it was a panic day, I just assumed mplab had a bug, removed that part of simulation, and blew a chip to test it instead. (which worked as expected). Sorry I haven't got a solution, but at least you know it's not just you... Steve Lawther ______________________________ Reply Separator _________________________________ Subject: MPLAB not MPASM Author: MIME:EraseMEsprenklespam_OUTTakeThisOuTBUSPROD.COM at INTERNET-HUSKY Date: 16/02/98 12:47 I reread my message about MPASM. It is MPLAB that I am referring to and it is the simulator that is giving me problems. Also the PC stays at 01FF not FF. I am using the 12C508 for the processor. I am trying to debug a program by stepping through it using the simulator. Like I said changing the input on pin GP3 to 0 using the Modify dialog box or simulator stimulus file make the simulator stay at the 01FF address. I am having the problem no matter what .asm file I use. -- David