boards:l053r8

32 MHz Arm Cortex-M0+ MCU with 64 KB flash, and 8KB RAM.

BUTTON
PC13 B1 USER

LED
PA5 LD2 GREEN

USART2 (ST-LINK)
PA2 TX AF4
PA3 RX AF4

OSC32
X2 ABS25-32.768KHZ-6-T

OSC_IN
MCO 8MHz