ATmega325P datasheet(127/364 Pages) ATMEL

Numer części	ATmega325P

Szczegółowy opis	8-bit Microcontroller with 32K Bytes In-System Programmable Flash

PDF	364 Pages

Scroll/Zoom	100%

Producent	ATMEL [ATMEL Corporation]

Strona internetowa	http://www.atmel.com

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127 / 364 page

127

8023F–AVR–07/09

ATmega325P/3250P

Figure 15-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f

clk_I/O/8)

Figure 15-12 shows the count sequence close to TOP in various modes. When using phase and

frequency correct PWM mode the OCR1x Register is updated at BOTTOM. The timing diagrams

will be the same, but TOP should be replaced by BOTTOM, TOP-1 by BOTTOM+1 and so on.

The same renaming applies for modes that set the TOV1 Flag at BOTTOM.

Figure 15-12. Timer/Counter Timing Diagram, no Prescaling

Figure 15-13 on page 128 shows the same timing data, but with the prescaler enabled.

OCFnx

OCRnx

TCNTn

OCRnx Value

OCRnx - 1

OCRnx

OCRnx + 1

OCRnx + 2

clk

I/O

clk

(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

(clk

I/O/1)

clk

I/O

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