Datasheet

129
2545T–AVR–05/11
ATmega48/88/168
Figure 16-13 shows the same timing data, but with the prescaler enabled.
Figure 16-13. Timer/counter timing diagram, with prescaler (f
clk_I/O
/8).
TOVn (FPWM)
and ICFn (if used
as TOP)
OCRnx
(update at TOP)
TCNTn
(CTC and FPWM)
TCNTn
(PC and PFC PWM)
TOP - 1
TOP TOP - 1 TOP - 2
Old OCRnx value New OCRnx value
TOP - 1 TOP BOTTOM BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O
/8)