[TI-H] Re: PIC16F84 Interfacing
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[TI-H] Re: PIC16F84 Interfacing
At 20:51 2001-08-09, you wrote:
>What do u mean with pull up resistors (hey, i'm 17!).
Like this:
5V or whatever your high voltage is.
___
|
4-10K or something
|
RA0 ---+-------- 3.9k ------ to ti92+ white wire
on both signal lines. (RA0, and RA1 in your case)
It pulls the line high when nothing keeps it low. Often needed in cases
like this.
I has to do with the port on the calc to be open collector, and the port on
the pic not beeing this.
It could get stuck low otherwise.
///Olle
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