Lpc2000

Hi,

I am working with the UART1 of the LPC2106 using the UARTecho sample program with the KickStart board from IAR.  The UART keeps generating the character time-out indicator interrupt.  I have looked through all of the documentation from Philips and I cannot find an explanation of what actually causes this interrupt. Does it mean that a stop bit was not found in nine bit times from the start bit? Does it mean that the receive FIFO overran? Is this lack of a clear and concise explanation indicative of Philips documentation? I am new to the LPC210x family, so please excuse my lack of understanding if the answer is obvious. I have worked mostly with Motorola micros and there documentation seems more concise.

Thanks,
Bob Davis

At 11:43 AM 4/6/04 -0400, you wrote:
>I am working with the UART1 of the LPC2106 using the UARTecho sample 
>program with the KickStart board from IAR.  The UART keeps generating the 
>character time-out indicator interrupt.  I have looked through all of the 
>documentation from Philips and I cannot find an explanation of what 
>actually causes this interrupt. Does it mean that a stop bit was not found 
>in nine bit times from the start bit? Does it mean that the receive FIFO 
>overran? Is this lack of a clear and concise explanation indicative of 
>Philips documentation? I am new to the LPC210x family, so please excuse my 
>lack of understanding if the answer is obvious. I have worked mostly with 
>Motorola micros and there documentation seems more concise.

Philips defers to the 16550 documentation for detailed explanations.  See 
for example http://www.national.com/pf/PC/PC16550D.html#Datasheet or
http://www-us16.semiconductors.com/pip/SC16C550IA44.html

The CTI essentially means that there are characters in the receive FIFO but 
not enough to pass the threshold and there are no characters coming in.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III

Bob,

take a look at the User Manual, p.89. Not too bad an explanation. ;-)

-uwe

----- Original Message -----
From: "Robert Davis" <rdavis@...>
To: <lpc2000@yahoogroups.com>
Sent: Tuesday, April 06, 2004 5:43 PM
Subject: [lpc2000] What is the UART CTI Interrupt?


> Hi,
>
> I am working with the UART1 of the LPC2106 using the UARTecho sample program with the KickStart board from IAR.  The UART keeps
generating the character time-out indicator interrupt.  I have looked through all of the documentation from Philips and I cannot
find an explanation of what actually causes this interrupt. Does it mean that a stop bit was not found in nine bit times from the
start bit? Does it mean that the receive FIFO overran? Is this lack of a clear and concise explanation indicative of Philips
documentation? I am new to the LPC210x family, so please excuse my lack of understanding if the answer is obvious. I have worked
mostly with Motorola micros and there documentation seems more concise.

>
> Thanks,
> Bob Davis
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>

You are right Uwe. I missed it. It was right under my nose ;) 

Thank you,
Bob Davis

--- In lpc2000@yahoogroups.com, "Uwe Arends" <Uwe_Arends@o...> wrote:
> Bob,
> 
> take a look at the User Manual, p.89. Not too bad an explanation. ;-
)
> 
> -uwe
> 
> ----- Original Message -----
> From: "Robert Davis" <rdavis@I...>
> To: <lpc2000@yahoogroups.com>
> Sent: Tuesday, April 06, 2004 5:43 PM
> Subject: [lpc2000] What is the UART CTI Interrupt?
> 
> 
> > Hi,
> >
> > I am working with the UART1 of the LPC2106 using the UARTecho 
sample program with the KickStart board from IAR.  The UART keeps
> generating the character time-out indicator interrupt.  I have 
looked through all of the documentation from Philips and I cannot
> find an explanation of what actually causes this interrupt. Does it 
mean that a stop bit was not found in nine bit times from the
> start bit? Does it mean that the receive FIFO overran? Is this lack 
of a clear and concise explanation indicative of Philips
> documentation? I am new to the LPC210x family, so please excuse my 
lack of understanding if the answer is obvious. I have worked
> mostly with Motorola micros and there documentation seems more 
concise.

> >
> > Thanks,
> > Bob Davis
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >