Hardware layout and configuration UM1724
16/68 UM1724 Rev 14
6.1 Pre-cut PCB
The STM32 Nucleo board is divided into two parts: ST-LINK part and target STM32 part.
The ST-LINK part of the PCB can be cut out to reduce the board size. In this case, the
remaining target STM32 part can only be powered by VIN, E5V, and +3.3V on the ST
morpho connector CN7, or VIN and +3.3V on ARDUINO
®
connector CN6. It is still possible
to use the ST-LINK part to program the main STM32 using wires between CN4 and SWD
signals available on the ST morpho connector (SWCLK CN7 pin 15 and SWDIO CN7 pin
13).
6.2 Embedded ST-LINK/V2-1
The ST-LINK/V2-1 programming and debugging tool is integrated into the STM32 Nucleo
board.
The ST-LINK/V2-1 makes the STM32 Nucleo boards Mbed Enabled™.
The embedded ST-LINK/V2-1 supports only SWD for STM32 devices. For information about
debugging and programming features, refer to the user manual ST-LINK/V2 in-circuit
debugger/programmer for STM8 and STM32 (UM1075), which describes in details all the
ST-LINK/V2 features.
The changes versus the ST-LINK/V2 version are listed below.
• New features supported on ST-LINK/V2-1:
– USB software re-enumeration
– Virtual COM port interface on USB
– Mass storage interface on USB
– USB power management request for more than 100 mA power on USB
• Features not supported on ST-LINK/V2-1:
–SWIM interface
– Minimum supported application voltage limited to 3 V
• Known limitation:
– Activating the readout protection on ST-LINK/V2-1 target prevents the target
application from running afterward. The target readout protection must be kept
disabled on ST-LINK/V2-1 boards.
There are two different ways to use the embedded ST-LINK/V2-1 depending on the jumper
states (see
Table 4 and Figure 6):
• Program/debug the on-board STM32 (Section 6.2.2)
• Program/debug an MCU in an external application board using a cable connected to
SWD connector CN4 (Section 6.2.4).
Table 4. Jumper states
Jumper state Description
Both CN2 jumpers ON
ST-LINK/V2-1 functions enabled for on-board programming
(default)
Both CN2 jumpers OFF
ST-LINK/V2-1 functions enabled for external CN4 connector
(SWD supported)
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