ATmega64A datasheet(131/392 Pages) ATMEL

Part #	ATmega64A

Description	8-bit Microcontroller with 64K Bytes In-System Programmable Flash

PDF	392 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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131 / 392 page

131

8160C–AVR–07/09

ATmega64A

Figure 15-11. Timer/Counter Timing Diagram, Setting of OCFnx, 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 OCRnx 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 TOVn flag at BOTTOM.

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

Figure 15-13 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

ATmega64A Datasheet(PDF) 131 Page - ATMEL Corporation

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