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Simulation RA4

 
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kamillas



Joined: 24 Oct 2011
Posts: 50

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Simulation RA4
PostPosted: Wed Feb 29, 2012 4:00 am     Reply with quote

Hi,
I want to know why in the simulation if I sent:

output_A(0b111111);


Proteus simulation gives me high impedance in the pin RA4.
RF_Developer



Joined: 07 Feb 2011
Posts: 839

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Re: Simulation RA4
PostPosted: Wed Feb 29, 2012 4:22 am     Reply with quote

kamillas wrote:
Hi,
I want to know why in the simulation if I sent:

output_A(0b111111);


Proteus simulation gives me high impedance in the pin RA4


Pin RA4 is an open drain output on some (maybe many PICs). It cannot force the pin to high, you have to have a pull-up. Check this on the data sheet for your PIC.

RF Developer
kamillas



Joined: 24 Oct 2011
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PostPosted: Wed Feb 29, 2012 4:50 am     Reply with quote

thank's Rf developer
temtronic



Joined: 01 Jul 2010
Posts: 9134
Location: Greensville,Ontario

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PostPosted: Wed Feb 29, 2012 6:29 am     Reply with quote

WOW !!! Proteus got something RIGHT???????
RF_Developer



Joined: 07 Feb 2011
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PostPosted: Wed Feb 29, 2012 7:12 am     Reply with quote

temtronic wrote:
WOW !!! Proteus got something RIGHT???????


Maybe not. I might be standing by a lamppost in a frozen forest....

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Ttelmah



Joined: 11 Mar 2010
Posts: 19260

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PostPosted: Wed Feb 29, 2012 7:45 am     Reply with quote

The silly thing is that the basic analog simulator on Proteus is very good. Where is has problems is in complex digital parts. Simple things like a transistor output, it'll usually get right.

There is a separate issue, down to how you use it, that it will automatically make connections to things like power pins, and then not show these. If you look at their examples, they deliberately put labelled pins showing these connections, while 'casual' users tend to omit these. Hence people following the circuit that results then omit these connections.

For what most people want a simulator for, it's digital handling of parts like the PIC's, is 'inadequate'. MPLAB is far more accurate, but harder to use.

I hate it, and believe it causes more problems than it ever solves, but don't expect basic things like this to not work.

Best Wishes
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