Skip to main content
Knowledgebase
Home
Renesas Electronics Europe - Knowledgebase

Causes for JTAG Debugger Errors

Last Updated:09/27/2017

Question:

I can no longer connect to the JTAG debugger, what could be the cause?

Answer:

There is the possibility that the TDI and TDO pins of the JTAG interface are used as general I/O ports.  If port 3 is set as a general I/O port by the software, JTAG communication cannot be performed.  If this is the case, modify your software to keep port 3 as TDI and TDO pins. 

While it is possible to use TDI and TDO pins as a general I/O port when debug mode is set as SWD (Serial Wire Debug) mode, the debug environment must support the SWD interface.

Suitable Products
RZ/T1