Datasheet

Functional overview STM32L476xx
60/270 DS10198 Rev 8
3.37 Development support
3.37.1 Serial wire JTAG debug port (SWJ-DP)
The Arm
®
SWJ-DP interface is embedded, and is a combined JTAG and serial wire debug
port that enables either a serial wire debug or a JTAG probe to be connected to the target.
Debug is performed using 2 pins only instead of 5 required by the JTAG (JTAG pins could
be re-use as GPIO with alternate function): the JTAG TMS and TCK pins are shared with
SWDIO and SWCLK, respectively, and a specific sequence on the TMS pin is used to
switch between JTAG-DP and SW-DP.
3.37.2 Embedded Trace Macrocell™
The Arm
®
Embedded Trace Macrocell™ provides a greater visibility of the instruction and
data flow inside the CPU core by streaming compressed data at a very high rate from the
STM32L476xx through a small number of ETM pins to an external hardware trace port
analyzer (TPA) device. Real-time instruction and data flow activity be recorded and then
formatted for display on the host computer that runs the debugger software. TPA hardware
is commercially available from common development tool vendors.
The Embedded Trace Macrocell™ operates with third party debugger software tools.
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