First off, thanks to the both of you for your replies. Kolban, your documentation is very helpful even for an absolute amateur like me. WiFive, your suggestion of the REG_SET_BIT command lead me to finding soc.h which has been very enlightening.
I've spent a lot of time on Google and Youtube last ...

Hi all
I started playing around with Arduino for work about two years ago and have quite enjoyed it. It was my first exposure to a C style language so there was quite a learning curve at the beginning. I've reached the stage where I used direct manipulation of the registers to control some things ...