# How to set external clock value for STM32F1?

I creating a project with the microcontroller STM32F101C8t. This microcontroller has an internal clock of 36MHz. My question is how to correctly set the external clock value, ie what crystal value should I use. I already set the external clock pins in the STM32CubeMX, now it is necessary to set the correct value for the external clock.

Depend on what external clock source you use, you must change HSE accordingly.