ATmega128 datasheet(155/386 Pages) ATMEL

Part #	ATmega128

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

PDF	386 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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155 / 386 page

155

2467S–AVR–07/09

ATmega128

•

The timer starts counting from a value higher than the one in OCR2A, and for that reason

misses the Compare Match and hence the OCn change that would have happened on the

way up.

Timer/Counter

Timing Diagrams

The Timer/Counter is a synchronous design and the timer clock (clk

T2) is therefore shown as a

clock enable signal in the following figures. The figures include information on when interrupt

flags are set. Figure 68 contains timing data for basic Timer/Counter operation. The figure

shows the count sequence close to the MAX value in all modes other than phase correct PWM

mode.

Figure 68. Timer/Counter Timing Diagram, no Prescaling

Figure 69 shows the same timing data, but with the prescaler enabled.

Figure 69. Timer/Counter Timing Diagram, with Prescaler (f

clk_I/O/8)

Figure 70 shows the setting of OCF2 in all modes except CTC mode.

clk

(clk

I/O/1)

TOVn

clk

I/O

TCNTn

MAX - 1

MAX

BOTTOM

BOTTOM + 1

TOVn

TCNTn

MAX - 1

MAX

BOTTOM

BOTTOM + 1

clk

I/O

clk

(clk

I/O/8)

ATmega128 Datasheet(PDF) 155 Page - ATMEL Corporation

ATmega128 Datasheet(HTML) 155 Page - ATMEL Corporation

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