Datasheet

187
ATmega640/1280/1281/2560/2561
2549K–AVR–01/07
Figure 74. Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O
/8)
Figure 75 shows the setting of OCF2A in all modes except CTC mode.
Figure 75. Timer/Counter Timing Diagram, Setting of OCF2A, with Prescaler (f
clk_I/O
/8)
Figure 76 shows the setting of OCF2A and the clearing of TCNT2 in CTC mode.
Figure 76. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode, with
Prescaler (f
clk_I/O
/8)
TOVn
TCNTn
MAX - 1 MAX BOTTOM BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O
/8)
OCFnx
OCRnx
TCNTn
OCRnx Value
OCRnx - 1 OCRnx OCRnx + 1 OCRnx + 2
clk
I/O
clk
Tn
(clk
I/O
/8)
OCFnx
OCRnx
TCNTn
(CTC)
TOP
TOP - 1 TOP BOTTOM BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O
/8)