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ATmega16U4 bảng dữ liệu(PDF) 128 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
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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) 128 Page - ATMEL Corporation

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7766D–AVR–01/09
ATmega16U4/ATmega32U4
Figure 14-13. Timer/Counter Timing Diagram, with Prescaler (f
clk_I/O/8)
14.10 16-bit Timer/Counter Register Description
14.10.1
Timer/Counter1 Control Register A – TCCR1A
14.10.2
Timer/Counter3 Control Register A – TCCR3A
• Bit 7:6 – COMnA1:0: Compare Output Mode for Channel A
• Bit 5:4 – COMnB1:0: Compare Output Mode for Channel B
• Bit 3:2 – COMnC1:0: Compare Output Mode for Channel C
The COMnA1:0, COMnB1:0, and COMnC1:0 control the output compare pins (OCnA, OCnB,
and OCnC respectively) behavior. If one or both of the COMnA1:0 bits are written to one, the
OCnA output overrides the normal port functionality of the I/O pin it is connected to. If one or
both of the COMnB1:0 bits are written to one, the OCnB output overrides the normal port func-
tionality of the I/O pin it is connected to. If one or both of the COMnC1:0 bits are written to one,
the OCnC output overrides the normal port functionality of the I/O pin it is connected to. How-
ever, note that the Data Direction Register (DDR) bit corresponding to the OCnA, OCnB or
OCnC pin must be set in order to enable the output driver.
TOVn(FPWM)
and ICF n(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
I/O
clk
Tn
(clk
I/O/8)
Bit
7
65
43
2
1
0
COM1A
1
COM1A
0
COM1B
1
COM1B
0
COM1C
1
COM1C
0
WGM11
WGM10
TCCR1A
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
7
65
43
2
1
0
COM3A
1
COM3A
0
COM3B
1
COM3B
0
COM3C
1
COM3C
0
WGM31
WGM30
TCCR3A
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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