Lpc2000

Using the Philips LPC 2129, I set-up an I2C slave mode to talk to a 
master device.  The microcontroller, recieves and sends data 
correctly most of the time, but about 1/100 times, when the MC 
recieves:

[SLA][W] it sends a NACK (no acknowledge) back to the master instead 
of an ACK.  In the software a NACK is never sent, so it is unclear 
why the hardware occasionally sends back a NACK. 

Has anyone else seen this behavior?  Could it be an errata with the 
Microcontroller?  I'm not sure what I can do to debug this?  Any 
suggestions?

You might receive NACK sometimes, what you could do is make your 
algorithm try again. Have you checked the Philips Document "80C51 
Family Derivatives - 8XC552/562 overview"??? (page 23)
It shows all the posible Status Codes you can get.. it's the guide 
while making your algorithm.

Regards,
Gonzalo

--- In lpc2000@yahoogroups.com, "skijag2" <skijag2@y...> wrote:
> Using the Philips LPC 2129, I set-up an I2C slave mode to talk to 
a 
> master device.  The microcontroller, recieves and sends data 
> correctly most of the time, but about 1/100 times, when the MC 
> recieves:
> 
> [SLA][W] it sends a NACK (no acknowledge) back to the master 
instead 
> of an ACK.  In the software a NACK is never sent, so it is unclear 
> why the hardware occasionally sends back a NACK. 
> 
> Has anyone else seen this behavior?  Could it be an errata with 
the 
> Microcontroller?  I'm not sure what I can do to debug this?  Any 
> suggestions?