S08 to S08 BDM bit routines use fewer resources now
S08 to S08 BDM bit routines use fewer resources now

Only one pin and one timer channel! It's tricky getting the TPM to share
with the regular pin driver.

I also made a small change in the 8M tx1 bit routine - its start bit is
now 5 cycles, rather than 4, and better matches the rx1 routine.
Probably not a big deal, but I wanted them to be the same.

nickhen/muforth,nickhen/muforth