STMicroelectronics STM32L152D-EVAL User Manual page 18

Hardware layout and configuration
Figure 7.
Note: If Bootloader_RESET signal is not used, remove R39 to avoid disturbance due to CTS
signal from pin8 of CN1, which could cause MCU reset with some software.
Table 14.
Jumper
USART1_RX is connected to RS-232 transceiver and RS-232 communication is
enabled when JP4 is set as shown to the right(Default setting):
JP4
USART1_RX is connected to IrDA transceiver and IrDA communication is
enabled when JP4 is set as shown to the right:
The LCD glass module has to be mounted on IO position for USART1 usage. Refer to
Section 2.6: LCD glass module
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R39 resistor placement
RS-232 & IrDA related jumpers
for detail.
Doc ID 022868 Rev 1
Description
UM1521
Setting