Hello,
We have an application for LPC2368, based on RL-ARM, that run UART communication. This is working very well.
For power consuming reasons, we need to slow the MCU clock down to 4 MHz (based on Internal Osc.). Now, the UART work well up to 57600 baud rate. But in 115200 bps, I cannot receive any data although sending data work well. The debugger isn't even reach the UART IRQ at all.
In the data sheet I found that "Standard baud rates such as 115200 can be achieved with any crystal frequency above 2 MHz."
What can be the problem? Is it possible that there is a conflict between UART and RL-ARM?
"But I cannot find any reference in Erratasheet."
I don't think NXP have officially posted any note. Just a "oops, sorry" and "your next batch shouldn't have this problem."
I think you might need to contact NXP - and then keep this thread updated with anything interesting the NXP application engineers might tell you.