ST STM32L053 - Using ST-LINK;V2-1 to Program;Debug the STM32 L053 C8 T6 on Board; Figure 6. STM32 L053 Discovery Board Connections

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UM1775 Hardware layout
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6.1.4 Using ST-LINK/V2-1 to program/debug the STM32L053C8T6 on board
To program the STM32L053C8T6 on board, simply plug in the two jumpers on CN4, as
shown in Figure 6 in pink, but do not use the CN5 connector as that could disturb the
communication with the STM32L053C8T6 of the STM32L053 Discovery board.
Figure 6. STM32L053 Discovery board connections