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- Internal or external oscillator 6 answers
We are working with a modern microcontroller ATXMega32E5, from the ATMEL XMega family.
Our aim is to use the UART of the controller for effective communication, with the speed of about 9600 or 4800 baud rate. We tested the controller with the internal default 2Mhz clock frequency. UART is working well in both 9600 and 4800 baud rates.
As the controller is working fine, Is it really critical to use an external crystal for the system clock?
We just want to know, whether to use the internal calibrated RC oscillator or any external crystal. Please elaborate the explanation