SWO and Trace

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by MathiasP on Mon Apr 22 23:28:07 MST 2013


I have a question regarding the LPC4357 debug features.

<strong>Extact from the user manual:</strong>

• The core frequency must be 120 MHz or lower to use the SWO function.
• The ETM trace capture speed is limited by the trace pin properties. The maximum
speed is 120 MHz when the EHS bit is set in the pin configuration register for the
multiplexed trace pins (Table 132).

<strong> My questions:</strong>

Does that mean I'm not able to use SWO when I'm running at full speed? 

What about the ETM: Can use use it at full speed (204 MHz)  and what does the limitation to 120 MHz mean in this case?


Best regards