RM0367 Rev 7 957/1043
RM0367 Debug support (DBG)
970
It also includes debug features dedicated to the STM32L0x3 microcontrollers:
• Flexible debug pinout assignment
• MCU debug box (support for low-power modes, control over peripheral clocks, etc.)
Note: For further information on debug functionality supported by the Arm
®
Cortex
®
-M0+ core,
refer to the Cortex
®
-M0+ Technical Reference Manual (see Section 33.2: Reference Arm®
documentation).
33.2 Reference Arm
®
documentation
• Cortex
®
-M0+ Technical Reference Manual (TRM)
It is available from www.infocenter.arm.com
• Arm
®
Debug Interface V5
• Arm
®
CoreSight Design Kit revision r1p1 Technical Reference Manual
33.3 Pinout and debug port pins
The STM32L0x3 MCUs are available in various packages with different numbers of
available pins.
33.3.1 SWD port pins
Two pins are used as outputs for the SW-DP as alternate functions of general purpose I/Os.
These pins are available on all packages.
33.3.2 SW-DP pin assignment
After reset (SYSRESETn or PORESETn), the pins used for the SW-DP are assigned as
dedicated pins which are immediately usable by the debugger host.
However, the MCU offers the possibility to disable the SWD port and can then release the
associated pins for general-purpose I/O (GPIO) usage. For more details on how to disable
SW-DP port pins, please refer to Section 9.3.2: I/O pin alternate function multiplexer and
mapping on page 240.
Table 172. SW debug port pins
SW-DP pin name
SW debug port
Pin
assignment
Type Debug assignment
SWDIO IO Serial Wire Data Input/Output PA13
SWCLK I Serial Wire Clock PA14
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