The Timer/Counter can be clocked directly
by the system clock (by setting the TCCR0B.CS0[2:0]=0x1). This provides the
fastest operation, with a maximum Timer/Counter clock frequency equal to system clock
frequency (fCLK_I/O).
Alternatively, one of four taps from the prescaler can be used as a clock source. The
prescaled clock has a frequency of either fCLK_I/O/8, fCLK_I/O/64, fCLK_I/O/256, or fCLK_I/O/1024.Figure 17-2. Prescaler for
Timer/Counter0
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