9 years ago
You're using the onboard TWI aren't you ?
9 years ago
Yes, i am.
Good. In that case, you can usually get away with the default port settings, but I recommend that you add an external pullup as well. The internal one is pretty weak.
how do it
External pull up ? What frequency are you intending to work at ?
sorry i read it wrongly thank you
this might help you
I'm not using picaxes I'm using arduino
Yes I know, BUT the principles are the same - This is a fairly good explanation of what it is all about.
You don't set the pull up/downs in the output mode on an AVR, you can only do it for input mode.
+1 Output means a pin on a digital IC like a Pic, Arduino or AVR is FORCED High or low by an internal process and a "pull up" is non sequitur when compared to a Real output pin. Of course you could be thinking of an open collector output like some sensors that need a pull up resistor. That does not occur ever in the land of micro-processors :-) A
Ermm. Some of the LPC series have that very functionality - configurably
Didn't know that.......... Really..., open collectors.......... Now I have to apologize to .act casual.
The pull up resistor is a passive device. In general outputs don't have a pull up they are active pins and will be high low or high impedance.Can you explain in more detail what your trying to do - Circuit diagrams help.