LOW will
set the
Port 0 pin corresponding to expression
to a negative
value (0V) and then set it to an output.
With the SuperPRO and PROplus, NXP has added more configurable port pins. We are adopting their convention for control of those pins. FIO0CLR, FIO1CLR, FIO2CLR, and FIO4CLR will set an output low when written with a 1. More details in the NXP user manuals.