Rainbow Electronics ATmega128RFA1 - Manual (Page 237)

237
8266A-MCU Wireless-12/09
ATmega128RFA1
Figure 17-9 shows the same timing data, but with the prescaler enabled.
Figure 17-9. Timer/Counter Timing Diagram with Prescaler (f
clk_I/O
/8)
TOVn
TCNTn MAX - 1 MAX BOTTOM BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O
/8)
Figure 17-10 shows the setting of OCF0B and OCF0A in all modes except CTC and
PWM mode, where OCR0A is TOP.
Figure 17-10. Timer/Counter Timing Diagram, setting of OCF0x with Prescaler (f
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)
Figure 17-11 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode and
fast PWM mode where OCR0A is TOP.
Figure 17-11. Timer/Counter Timing Diagram, Clear Timer on Compare Match mode
with Prescaler (f
clk_I/O
/8)
OCFnx
OCRnx
TCNTn
(CTC)
TOP
TOP - 1 TOP BOTTOM BOTTOM + 1
clk
I/O
clk
Tn
(clk
I/O
/8)