UBX-21008123 - R02
Interfaces and peripherals
Page 33 of 42
C1-Public
Connector
annotation
Pin
number
Schematic net name
nRF52
pin
Description
17
GND
GND
Ground
18
TRACE_DATA2/IO_14
P0.11
Parallell trace data signal
19
GND
GND
Ground
20
TRACE_ DATA3/IO_13
P1.09
Parallell trace data signal
Table 14: Pinout of the additional interfaces
Extra USB to UART interface
If the evaluation board is connected to a PC using the USB connector J8, two serial COM ports are
available. The COM port labeled “JLink CDC UART” (on a Windows PC) is not normally connected to
anything but is routed as a 4-pin UART interface to the pin header J20. This interface could be
connected to a secondary UART interface on the ANNA-B4 module, or to a UART interface on an
Arduino shield for example.
CPU trace interface
The Arm
®
Cortex
®
-M4F processor in ANNA-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 ANNA-B4 module. A special external
debugger is required for tracing instructions through this connector.
☞
Note that the 50 mil pitch pin header is not soldered onto the evaluation board by default.
Содержание EVK-ANNA-B4
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