Post by thread:[PIC]: WDT

Hi all: Is there any problem if a PIC is constantly reseted by a WDT (every 18 ms)? In other words, code runs for 18 ms, after that a reset is generated by WDT and then code runs again... Does somebody know something about it? Thanks in advance, Gonzalo -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

as far as i can tell, there is no problem from the hardware side. in fact, i have used WDT to measure temperature, and letting it time out is the only way to do so. still, it seems like an awkward way to end normal operation. a. {Quote hidden}> Hi all: > > Is there any problem if a PIC is constantly reseted by a WDT (every 18 > ms)? > > In other words, code runs for 18 ms, after that a reset is generated by > WDT and then code runs again... > > Does somebody know something about it? > > Thanks in advance, > > Gonzalo > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email spam_OUTlistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Some time ago I posted this, but without responses... ;) Hi all: Is there any problem if a PIC is constantly reseted by a WDT (every 18 ms)? In other words, code runs for 18 ms, after that a reset is generated by WDT and then code runs again... Does somebody know something about it? Thanks in advance, Gonzalo -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

> > > In other words, code runs for 18 ms, after that a reset is generated by >WDT and then code runs again... > > Does somebody know something about it? It's not a "problem" unless that is not what should be happening. That's up to you to determine, as the programmer. The PIC dosen't care, it just does what you tell it to do. -- Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

| > In other words, code runs for 18 ms, after that a reset is generated by | >WDT and then code runs again... | > | > Does somebody know something about it? | | It's not a "problem" unless that is not what should be happening. | That's up to you to determine, as the programmer. In this case, I want it... | | The PIC dosen't care, it just does what you tell it to do. | That4s why I like PICs :) I asked that question because I have a little board working in a very noisy place, program is easy, just monitor some inputs and according to them trigger some relays... well, because of the noise my PIC used to hung up... so I decide to reset it every 18 ms using WDT, and my problem is gone... Gonzalo -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body

> > I asked that question because I have a little board working in a very >noisy place, program is easy, just monitor some inputs and according to them >trigger some relays... well, because of the noise my PIC used to hung up... >so I decide to reset it every 18 ms using WDT, and my problem is gone... That would make me very nervous. You need to chase down what's happening, not just mask it out. -- Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

> Some time ago I posted this, but without responses... ;) No, I remember this. Plenty of people responded. > In other words, code runs for 18 ms, after that a reset is generated >by >WDT and then code runs again... I believe the general consensus was that there was no problem with this, except for the additional delays it would create in the code. As long as you're not doing anything with the WDT reset (i.e., changing registers), it shouldn't disrupt any of your other code. --Andrew _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservspam_OUTmitvma.mit.edu with SET PICList DIGEST in the body

Gonzalo Jimenez Yamasaki: I do not think so. I have a circuit using a 12c608 that interrupts every 18 mS on the WDT. I use it for timing that is not at all critical. The circuit has been running for about 16 months now. The power supply is 2 AA batteries 3 volt . When the batteries go dead, I will through it away. bill jacobs Gonzalo Jimenez Yamasaki wrote: {Quote hidden}> > Some time ago I posted this, but without responses... ;) > > Hi all: > > Is there any problem if a PIC is constantly reseted by a WDT (every 18 > ms)? > > In other words, code runs for 18 ms, after that a reset is generated by > WDT and then code runs again... > > Does somebody know something about it? > > Thanks in advance, > > Gonzalo > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email KILLspamlistservKILLspammitvma.mit.edu with SET PICList DIGEST in the body