Post by thread:[PIC]: how to disable the WDT in MAPLAB SIM ?

Hello, I am trying to run a small PIC16F84 assembly program on MAPLAB SIM but have problems disabling the WDT. If the program does not call clrwdt periodically, the program counter jumps after short time to the reset vector and bit 4 of the status register becomes '0'. Based on some example I saw, the program starts with : {Quote hidden}>> list p=16F84 ; select processor type >> #include <p16F84.inc> ; read processor definitions >> radix dec >> >> >>; >>; Processor config word >>; >> >>configWord equ (_CP_OFF & _WDT_OFF & _PWRTE_ON & _RC_OSC) >> >> __CONFIG configWord ;; generates: 2007 3FF3 and in the IDE, Project -> Edit Project -> Change -> Configuration -> Watch Dog Timer is set to 'None'. Any idea how to disable the WDT in the simulator ? Thanks, Tal -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

>problems disabling >the WDT. Are you setting SWDTEN bit of WDTCON register in any part of your program? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

I had this problem with the 16f84a. I searched through the forums on Microchip's site and found that this was a known problem. The work around was to download MPLAB version 5.31 which does not have the WDT problem. I installed version 5.31 and now I can run the simulation successfully. I must have wasted about 6 hours on this problem. At 12:14 PM 5/8/02 +0200, you wrote: > >problems disabling > >the WDT. > >Are you setting SWDTEN bit of WDTCON register in any part of your program? > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

'WDTCON' register ? I could not find anything of that name in the 16F84 spec. Tal {Quote hidden}> -----Original Message----- > From: pic microcontroller discussion list > [.....PICLISTKILLspam@spam@MITVMA.MIT.EDU]On Behalf Of Carlos Ojea > Sent: Wednesday, May 08, 2002 3:15 AM > To: PICLISTKILLspamMITVMA.MIT.EDU > Subject: Re: [PIC]: how to disable the WDT in MAPLAB SIM ? > > > >problems disabling > >the WDT. > > Are you setting SWDTEN bit of WDTCON register in any part of your program? > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

>'WDTCON' register ? > >I could not find anything of that name in the 16F84 spec. I am using a 18C452, in that PIC you could enable or disable WDT using a bit of WDTCON register. Don't know wich register 16F84 uses for this purpose. Regards -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

None during runtime, the 16F84 (along with most other PICs in it's class) has control of the WDT in the programming fuses, it cannot be enabled/disabled during runtime. TTYL > {Original Message removed}

'WDTCON' register ? I could not find anything of that name in the 16F84 spec. Tal {Quote hidden}> -----Original Message----- > From: pic microcontroller discussion list > [.....PICLISTKILLspam.....MITVMA.MIT.EDU]On Behalf Of Carlos Ojea > Sent: Wednesday, May 08, 2002 3:15 AM > To: EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU > Subject: Re: [PIC]: how to disable the WDT in MAPLAB SIM ? > > > >problems disabling > >the WDT. > > Are you setting SWDTEN bit of WDTCON register in any part of your program? > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.