[SOLVED] AVR Internal 1MHz RC vs external crystal 12 MHz

[Don_dody]

What is the different between using the AVR internal 1MHz RC and using external crystal i.e 12MHz ?

If the MCU is completed already with internal RC, why should we use external crystal ?

 

[Jestin_cubetech]

external crystals are more accurate.

 

[alexan_e]

Yes accuracy and higher clock frequency if you need it