ATMEGA8_08 Datasheet, PDF (115/308 Pages) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

ATmega8(L)
Figure 53 shows the same timing data, but with the prescaler enabled.
Figure 53. Timer/Counter Timing Diagram, with Prescaler (f_{clk_I/O}/8)
clk_I/O
clk_Tn
(clk_I/O/8)
TCNTn
MAX - 1
MAX
BOTTOM
TOVn
BOTTOM + 1
Figure 54 shows the setting of OCF2 in all modes except CTC mode.
Figure 54. Timer/Counter Timing Diagram, Setting of OCF2, with Prescaler (f_{clk_I/O}/8)
clk_I/O
clk_Tn
(clk_I/O/8)
TCNTn
OCRn - 1
OCRn
OCRn + 1
OCRn + 2
OCRn
OCRn Value
OCFn
Figure 55 shows the setting of OCF2 and the clearing of TCNT2 in CTC mode.
2486T–AVR–05/08
115