> Do I use a timer or do I setup a set of delay loops

The simplest way is to let the timer, eg TMR1, free-run and generate
interrupts which can be counted

1s at 20MHz crystal is 5,000,000 cycles. Using a 16-bit timer this
means 5,000,000 / 65,536 =3D 76 overflow interrupts

Plus (5,000,000 - (76 x 65,536)) =3D 19,264 more cycles

A RAM counter is incremented every interrupt, and at the 76th the
timer is loaded with - 19,264. The next interrupt is the 5,000,000
count. It will actually be a few less than this as you have to account
for the time taken to load the value.

You can also take off a few for the s/w to react to that 77th interrupt
and set/unset the pin

If you used a 19.6608MHz then there would be no need for a load,
as (19,660,800 / 4) is exactly divisible by 65,536 =3D 75 interrupts

Joe
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.