The internal crystal oscillator of the microcontroller is generally not accurate enough and has a large error. However, the internal crystal oscillator and the external crystal oscillator of the microcontroller have the same function, which is to provide the system with a clock. If the frequency requirement is not high (for example, if it does not involve serial communication and precise timing, etc.), the internal crystal oscillator is sufficient, and the cost is low. The frequency of the internal clock is affected by temperature and other factors, but it can save the money of the crystal oscillator and there are 2 I/Os. Therefore, if the frequency requirement is not high, the internal oscillation is generally preferred. If you want to save power and use SLEEP, then you can't use the internal oscillation, and the internal oscillation will stop!
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