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ATmega325P 데이터시트(PDF) 127 Page - ATMEL Corporation

부품명 ATmega325P
상세설명  8-bit Microcontroller with 32K Bytes In-System Programmable Flash
PDF  364 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega325P 데이터시트(HTML) 127 Page - ATMEL Corporation

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127
8023F–AVR–07/09
ATmega325P/3250P
Figure 15-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
clk_I/O/8)
Figure 15-12 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 15-12. Timer/Counter Timing Diagram, no Prescaling
Figure 15-13 on page 128 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
Tn
(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
Tn
(clk
I/O/1)
clk
I/O



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