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'[PICLIST] [PIC}: connect tw0 16F84s'
2002\04\17@091714 by Raymond Mouthaan

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Hello Picers,

Just a simple question for you guys.

Is it oke to connect two input ports of two different 16F84's together?

E.g. PortA.0 (input of pic1) connected to PortA.0 (input of pic2).

And what about two Outputs (I guess that not oke)

Regards,

Ray

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2002\04\17@092357 by Sid Weaver

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For Ray

Yes, but use a 1K resistor just to be safe.

Sid

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2002\04\17@154615 by Benjamin Bromilow

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Hi Ray,

As PIC port pins are by default inputs, unless there was a coding error
whereby the pins became outputs at opposite logic levels there shouldn't be
a problem. To be super-duper safe you could add an in-line resistor so that
if this happened the current drawn would be below the maximum level......
(20mA AFAIR for the '84)

[PIC1, A0]-----R1-----[PIC2, A0]
Ohms law tells us that the minimum resistance is given by
Resistance needed=Vdd/0.02 (250ohm for 5v VDD)
I've done this in a project using a one-wire bidirectional serial link. The
resistor protected the PICs in case both became outputs at the same time...

Ben

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