STMicroelectronics Discovery kit for STM32L151/152 line - with STM32L152RC MCU STM32L152C-DISCO STM32L152C-DISCO Hoja De Datos

DocID022799 Rev 6

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. 
The JTAG JTMS and JTCK pins are shared with SWDAT and SWCLK, respectively, and a 
specific sequence on the JTMS pin is used to switch between JTAG-DP and SW-DP.

The JTAG port can be permanently disabled with a JTAG fuse.

The ARM

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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 
STM32L15xxC through a small number of ETM pins to an external hardware trace port 
analyzer (TPA) device. The TPA is connected to a host computer using USB, Ethernet, or 
any other high-speed channel. Real-time instruction and data flow activity can be recorded 
and then formatted for display on the host computer running debugger software. TPA 
hardware is commercially available from common development tool vendors. It operates 
with third party debugger software tools.