2025-06-26 8:52 PM
Hello Friends,
Most STM32 based Evolution / Development Board has Crystal 32.768 Khz and Boot switch connected.
In my Custom design board , I do not need RTC Function and Bootloader to load.
8 Mhz Crystal is used for Master Clock.
Can I remove 32.768 khz Crystal and Bootloader Switch from Boot0 pin ?
What should be default level maintain on these pins after removing both ?
Solved! Go to Solution.
2025-06-26 10:05 PM
The crystal can be omitted, the pins can be left open or used as GPIO pins. BOOT0 should be connected to GND via a 10k current limiting resistor. See AN4206 Application note "Getting started with STM32F3 series hardware development"
hth
KnarfB
2025-06-26 10:05 PM
The crystal can be omitted, the pins can be left open or used as GPIO pins. BOOT0 should be connected to GND via a 10k current limiting resistor. See AN4206 Application note "Getting started with STM32F3 series hardware development"
hth
KnarfB
2025-07-24 10:02 PM
Thank you , KnarfB
That is Helpful.
About Reset Pin in AN4206 ( Page 31) , NRST pin is not Connected to 3.3V , it is left Floating with Capacitor.
Is that Okay ?
Regards,