16F684 and RA2

Hello, I've been working with my new programmer and pic chips and all is well except for RA2 being an input. I've been reading the data sheet and the only thing I see different for this input is it is labeled "ST" as compared to "TTL" like the rest of the inputs what does this mean? When I push the button for PortA.0 and PortA.1 the respective lights turn on, but not when PortA.2 is pushed. I have a weak pull down resistor in between each switch, if I remove the resistor for RA2 it works fine.

Code:

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Loop: 
portc.0 = porta.0
portc.1 = porta.1
portc.2 = porta.2


Goto loop

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http://www.picbasic.co.uk/forum/showthread.php?t=561