Datasheet

Figure 19-9. 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)
Note: The “n” in the register and bit names indicates the device number (n = 0 for timer/counter 0), and
the “x” indicates output compare unit (A/B).
The next figure shows the setting of OCF0B in all modes and OCF0A in all modes (except CTC mode
and PWM mode where OCR0A is TOP).
Figure 19-10. 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)
Note: The “n” in the register and bit names indicates the device number (n = 0 for timer/counter 0), and
the “x” indicates output compare unit (A/B).
The next figure shows the setting of OCF0A and the clearing of TCNT0 in CTC mode and fast PWM
mode where OCR0A is TOP.
ATmega48PA/88PA/168PA
8-bit Timer/Counter0 (TC0) with PWM
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002011A-page 148