I'm trying to program a macro stopwatch for purpose of displaying it on
a TV scoreboard/"FoxBox", yet the information I've found online hasn't
proven precise. I'd like for this stopwatch to count down by tenths of
a second, in addition to count up as much as 100ths of a second (for
track races). Also, it needs to be able to restart where it left off
instead of reseting or continuing as though I hadn't stopped it.

I'm probably asking for too much, but every little bit helps.