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ATtiny44 データシート(PDF) 104 Page - ATMEL Corporation

部品番号 ATtiny44
部品情報  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  236 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny44 データシート(HTML) 104 Page - ATMEL Corporation

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104
8006H–AVR–10/09
ATtiny24/44/84
Figure 12-11. Timer/Counter Timing Diagram, Setting of OCF1x, with Prescaler (f
clk_I/O/8)
Figure 12-12 on page 104 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 12-12. Timer/Counter Timing Diagram, no Prescaling
Figure 12-13 on page 105 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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