Switchable Inverted Comm

[Archangel]

I've never used this for sending inverted data with the USART, but it's really handy for
using the TX pin as an output on a 16F690.

With the USART setup to receive data, you can flip BAUDCTL.4 to set or clear the
hardware USART TX pin. Without it, you're stuck with the TX pin at logic 1 whenever the
USART is enabled.

I gotta try this out, would have saved me ripping up a PC board design if I had read this earlier, thanks Bruce ! And thanks to Mark for the heads up too !