ATMEGA649 datasheet(125/375 Pages) ATMEL

Part #	ATMEGA649

Description	8-bit Microcontroller with In-System Programmable Flash

PDF	375 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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125 / 375 page

125

ATmega329/3290/649/6490

2552H–AVR–11/06

Figure 51. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f

clk_I/O/8)

Figure 52 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 52. Timer/Counter Timing Diagram, no Prescaling

Figure 53 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

ATMEGA649 Datasheet(PDF) 125 Page - ATMEL Corporation

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