ATmega32A datasheet(111/352 Pages) ATMEL

Part #	ATmega32A

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

PDF	352 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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111 / 352 page

111

8155B–AVR–07/09

ATmega32A

Figure 16-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f

clk_I/O/8)

Figure 16-12 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 16-12. Timer/Counter Timing Diagram, no Prescaling

Figure 16-13 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

ATmega32A Datasheet(PDF) 111 Page - ATMEL Corporation

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