A framing error occures when you don't have a stop bit when you are suppose=
d to =

have it (a space or high on 5V and low on RS232 i think). That means that y=
ou =

already have clocked in as many bits as you should to receive a byte and th=
en =

you will get a receive interrupt (after the stop bit (should) have been =

received).

So, yes - in order to get a framing error you will have the RCIF flag set a=
nd =

you do get an interrupt if the RCIE, PEIE and GIE are all set.

/Ruben

> =

> > Hi all. I'm having a bit of trouble verifying if a framing error in
> > the UART will cause a receive interrupt. I'll likely be using the
> > 18f2420. The datasheet talks about how to clear a framing error, and
> > it talks about how to enable the receive interrupt flag, but it
> > doesn't seem to talk about what happens in an error situation.
> >
> > I've found a few documents on the web that mention framing errors
> > blocking subsequent interrupts (which makes sense since you need to
> > clear the interrupt by reading the receive register).
> >
> > Can anyone help enlighten me?
> >
> > Thanks!
> >
> > Josh
> > --
> =

> =

> When the uart receives a break, a 0x00 shows up in RXREG, the FE bit is
> set, and RXIF is set (just like receiving any other character). There is
> some discussion of this at
> http://www.microchip.com/forums/tm.aspx?m=3D485444 .
> =

> Harold
> =

> =

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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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