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ATmega16U4 bảng dữ liệu(PDF) 127 Page - ATMEL Corporation

tên linh kiện ATmega16U4
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 16/32K Bytes of ISP Flash and USB Controller
PDF  408 Pages
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nhà sản xuất  ATMEL [ATMEL Corporation]
Trang chủ  http://www.atmel.com
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ATmega16U4 bảng dữ liệu(HTML) 127 Page - ATMEL Corporation

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7766D–AVR–01/09
ATmega16U4/ATmega32U4
Figure 14-11. Timer/Counter Timing Diagram, Setting of OCFnx, with Prescaler (f
clk_I/O/8)
Figure 14-12 shows the count sequence close to TOP in various modes. When using phase and
frequency correct PWM mode the OCRnx 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 TOVn Flag at BOTTOM.
Figure 14-12. Timer/Counter Timing Diagram, no Prescaling
Figure 14-13 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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