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ATmega1284P bảng dữ liệu(PDF) 133 Page - ATMEL Corporation

tên linh kiện ATmega1284P
Giải thích chi tiết về linh kiện  8-bit Microcontroller with 128K Bytes In-System Programmable Flash
PDF  380 Pages
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ATmega1284P bảng dữ liệu(HTML) 133 Page - ATMEL Corporation

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133
8059D–AVR–11/09
ATmega1284P
Note:
1. The CTCn and PWMn1:0 bit definition names are obsolete. Use the
WGMn2:0 definitions. However, the functionality and
location of these bits are compatible with previous versions of the timer.
14.11.2
TCCRnB – Timer/Counter n Control Register B
• Bit 7 – ICNCn: Input Capture Noise Canceler
Setting this bit (to one) activates the Input Capture Noise Canceler. When the noise canceler is
activated, the input from the Input Capture pin (ICPn) is filtered. The filter function requires four
successive equal valued samples of the ICPn pin for changing its output. The Input Capture is
therefore delayed by four Oscillator cycles when the noise canceler is enabled.
• Bit 6 – ICESn: Input Capture Edge Select
This bit selects which edge on the Input Capture pin (ICPn) that is used to trigger a capture
event. When the ICESn bit is written to zero, a falling (negative) edge is used as trigger, and
when the ICESn bit is written to one, a rising (positive) edge will trigger the capture.
When a capture is triggered according to the ICESn setting, the counter value is copied into the
Input Capture Register (ICRn). The event will also set the Input Capture Flag (ICFn), and this
can be used to cause an Input Capture Interrupt, if this interrupt is enabled.
Table 14-5.
Waveform Generation Mode Bit Description
(1)
Mode
WGMn3
WGMn2
(CTCn)
WGMn1
(PWMn1)
WGMn0
(PWMn0)
Timer/Counter Mode of
Operation
TOP
Update of
OCRn
x at
TOVn Flag
Set on
0
0
0
0
0
Normal
0xFFFF
Immediate
MAX
1
0
0
0
1
PWM, Phase Correct, 8-bit
0x00FF
TOP
BOTTOM
2
0
0
1
0
PWM, Phase Correct, 9-bit
0x01FF
TOP
BOTTOM
3
0
0
1
1
PWM, Phase Correct, 10-bit
0x03FF
TOP
BOTTOM
4
0
1
0
0
CTC
OCRnA
Immediate
MAX
5
0
1
0
1
Fast PWM, 8-bit
0x00FF
BOTTOM
TOP
6
0
1
1
0
Fast PWM, 9-bit
0x01FF
BOTTOM
TOP
7
0
1
1
1
Fast PWM, 10-bit
0x03FF
BOTTOM
TOP
8
100
0
PWM, Phase and Frequency
Correct
ICRn
BOTTOM
BOTTOM
9
100
1
PWM, Phase and Frequency
Correct
OCRnA
BOTTOM
BOTTOM
10
1
0
1
0
PWM, Phase Correct
ICRn
TOP
BOTTOM
11
1
0
1
1
PWM, Phase Correct
OCRnA
TOP
BOTTOM
12
1
1
0
0
CTC
ICRn
Immediate
MAX
13
1
1
0
1
(Reserved)
–
–
–
14
1
1
1
0
Fast PWM
ICRn
BOTTOM
TOP
15
1
1
1
1
Fast PWM
OCRnA
BOTTOM
TOP
Bit
765
4
3
2
1
0
ICNCn
ICESn
–
WGMn3
WGMn2
CSn2
CSn1
CSn0
TCCRnB
Read/Write
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
Initial Value000
0
0
0
0
0



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