On Thu, Sep 1, 2011 at 7:10 PM, Nathan House <nathanpiclist@gmail.com> wrot=
e:
> My PIC18 datasheet says the following:
>
> "Once the TXREG register transfers the data to the TSR register ...
> the TXREG register is empty ..."
>
> In my ISR, I have this:
>
>
> =A0 =A0 =A0 =A0if(PIR1bits.RCIF =3D=3D 1) // if the USART receive interru=
pt flag has been set
> =A0 =A0 =A0 =A0{
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if(TXREG =3D=3D 0) // check if the TXREG i=
s empty
>

Why do you think "empty" means "zeroed"?

I think "empty" means "don't care" and you must look at TXIF to see if
it is empty or not.

Regards,
Mark
markrages@gmail
--=20
Mark Rages, Engineer
Midwest Telecine LLC
markrages@midwesttelecine.com

--=20
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