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ATMEGA640 датащи(PDF) 124 Page - Microchip Technology

номер детали ATMEGA640
подробное описание детали  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 датащи(HTML) 124 Page - Microchip Technology

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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
Tn
(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
Tn
(clk
I/O/8)
OCFnx
OCRnx
TCNTn
OCRnx Value
OCRnx - 1
OCRnx
OCRnx + 1
OCRnx + 2
clk
I/O
clk
Tn
(clk
I/O/8)



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