On Sep 1, 2011, at 6:10 PM, Nathan House wrote:

> "Once the TXREG register transfers the data to the TSR register ...
> the TXREG register is empty ..."

"And the TXIF flag is set"

> I added the IF statement to check if the TXREG register is empty.

You're confusing "empty" with "reads as zero."  What did you expect to =20
have happen if you transmitted a null (zero) byte?  You can't tell =20
whether a register is "empty" except by checking some additional flag =20
(or value) that MEANS it's empty by whatever criteria happen to mean =20
"empty" for that peripheral.  (In this case, "the character has been =20
transferred to another register, and you're allowed to put a new =20
character in the register.")

BillW

--=20
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