EVK-NINA-B4 - User guide
UBX-19054587 - R03
Interfaces and peripherals
Page 31 of 38
C1 - Public
CPU trace interface
The Arm Cortex-M4Fprocessor in NINA-B4 modules supports tracing of CPU instructions through the
20-pin, 50 mil pitch, Cortex Debug + ETM connector. This extended connector has the same features
as J12, but also accommodates instruction trace operations through the Embedded Trace Macrocell
(ETM) of the Cortex-M4 microcontroller in the NINA-B4 module. Tracing instructions through this
connector requires a special external debugger.
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Note that the 50 mil pitch pin header is not soldered onto the evaluation board by default.
