ATMEGA640 datasheet(124/436 Pages) MICROCHIP

tên linh kiện	ATMEGA640

Giải thích chi tiết về linh kiện	8-bit Microcontroller with 16/32/64KB In-System Programmable Flash

PDF	436 Pages

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

16.8 Timer/Counter Timing Diagrams

The Timer/Counter is a synchronous design and the timer clock (clkT0) is therefore shown as a clock enable signal

in the following figures. The figures include information on when Interrupt Flags are set. Figure 16-8 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 16-8. Timer/Counter Timing Diagram, no Prescaling

Figure 16-9 shows the same timing data, but with the prescaler enabled.

Figure 16-9. Timer/Counter Timing Diagram, with Prescaler (fclk_I/O/8)

Figure 16-10 shows the setting of OCF0B in all modes and OCF0A in all modes except CTC mode and PWM

mode, where OCR0A is TOP.

Figure 16-10. Timer/Counter Timing Diagram, Setting of OCF0x, with Prescaler (fclk_I/O/8)

Figure 16-11 on page 125 shows the setting of OCF0A and the clearing of TCNT0 in CTC mode and fast PWM

mode where OCR0A is TOP.

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)

OCFnx

OCRnx

TCNTn

OCRnx Value

OCRnx - 1

OCRnx

OCRnx + 1

OCRnx + 2

clk

I/O

clk

(clk

I/O/8)

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