ATEMGA128-16AI View Datasheet(PDF) - Atmel Corporation

Part Name

Description

MFG CO.

ATEMGA128-16AI

8-bit Microcontroller with 128K Bytes In-System Programmable Flash

Atmel Corporation 

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ATmega128

Figure 55. Timer/Counter Timing Diagram, Setting of OCFnx, no Prescaling

clkI/O

clkTn

(clkI/O/1)

TCNTn

OCRnx - 1

OCRnx

OCRnx + 1

OCRnx + 2

OCRnx

OCRnx Value

OCFnx

Figure 56 shows the same timing data, but with the prescaler enabled.

Figure 56. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (fclk_I/O/8)

clkI/O

clkTn

(clkI/O/8)

TCNTn

OCRnx - 1

OCRnx

OCRnx + 1

OCRnx + 2

OCRnx

OCRnx Value

OCFnx

Figure 57 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.

2467O–AVR–10/06

131

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