STMicroelectronics UM1079 User Manual page 22

Hardware and layout
SB3 (BOOT0)
SB19 (BOOT1)
SB17 (MCO)
1. Default SBx state is shown in bold.
2. SB17 and SB20 are OFF to allow the user to choose between MCO and X3 crystal for clock source.
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Table 6. Solder bridges (continued)
Bridge State
ON
OFF
OFF
ON
OFF
(2)
ON
DocID018789 Rev 4
(1)
The BOOT0 signal of the STM32L152RCT6 is held low
through a 510 Ω pull-down resistor.
The BOOT0 signal of the STM32L152RCT6 is held high
through a 10 KΩ pull-up resistor.
The BOOT1 signal of the STM32L152RCT6 is held high
through a 10 KΩ pull-up resistor.
The BOOT1 signal of the STM32L152RCT6 is held low
through a 510 Ω pull-down resistor.
STM32L152RCT6 MCO clock signal is not used.
STM32L152RCT6 MCO clock signal is connected to OSC_IN
of the STM32L152RCT6
Description
UM1079