Hi guys,
I want to build my own Microcontroller development board from scratch, as I was checking the data sheet for the STM32F103C8T6 and STM32405RGT6 processors, there were 2 crystals specified on the data sheet. But when I look at tutorials online on how to design your own Microcontroller development board, he doesn't use a crystal at all (https://www.youtube.com/watch?v=tgUx0Gm7-RM you can skip to 18:27 to see his schematic).
And when I was watching another video on how to make your own (drone) Flight Controller this guys just uses 1 crystal than the two given on the data sheet (https://www.youtube.com/watch?v=Uu2vGFMq4Zo&list=PLoPtpxJIxgnYnPrOeGHs3rdhhPgNGIYN5&index=5 you can jump to 2:22 to see the schematic he is using.)
I am getting very confused wether I should put 2 crystals, 1, or no crystal on my board. Also, I am a 12th grader who has a passion in electronics and don't know much of the stuff as you know, so please try to make it simple for me to understand.
Thank you
