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5. Crystal oscillator
Figure 5-1:
Crystal oscillator
module (X1)
The use of crystal in all other schematics is implied even if
it is purposely left out, because of the schematics clarity.
Board is equipped with an
8MHz crystal oscillator (X1)
circuit that
provides external clock to the microcontroller OSC pins. This base
frequency is suitable for further clock multipliers and ideal for generation
of the necessary USB clock, which ensures proper operation of bootloader
and your custom USB-based applications. Board also contains
32.768kHz
Crystal oscillator (X3)
which provides external clock for the internal
RTCC
module.
note
