
128
ATmega64A [DATASHEET]
8160D–AVR–02/2013
Note:
The CTCn and PWMn1:0 bit definition names are obsolete. Use the
WGMn2:0 definitions. However, the functionality and loca-
tion of these bits are compatible with previous versions of the timer.
16.11.3
TCCR1B – Timer/Counter1 Control Register B
16.11.4
TCCR3B – Timer/Counter3 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.
Table 16-5.
Waveform Generation Mode Bit Description
Mode
WGMn3
WGMn2
(CTCn)
WGMn1
(PWMn1)
WGMn0
(PWMn0)
Timer/Counter Mode of
Operation
TOP
Update of
OCRn
x at
TOVn Flag
Set on
0
Normal
0xFFFF
Immediate
MAX
1
0
1
PWM, Phase Correct, 8-bit
0x00FF
TOP
BOTTOM
2
0
1
0
PWM, Phase Correct, 9-bit
0x01FF
TOP
BOTTOM
3
0
1
PWM, Phase Correct, 10-bit
0x03FF
TOP
BOTTOM
4
0
1
0
CTC
OCRnA
Immediate
MAX
5
0
1
0
1
Fast PWM, 8-bit
0x00FF
BOTTOM
TOP
6
0
1
0
Fast PWM, 9-bit
0x01FF
BOTTOM
TOP
7
0
1
Fast PWM, 10-bit
0x03FF
BOTTOM
TOP
8
1
0
PWM, Phase and Frequency
Correct
ICRn
BOTTOM
9
1
0
1
PWM, Phase and Frequency
Correct
OCRnA
BOTTOM
10
1
0
1
0
PWM, Phase Correct
ICRn
TOP
BOTTOM
11
1
0
1
PWM, Phase Correct
OCRnA
TOP
BOTTOM
12
1
0
CTC
ICRn
Immediate
MAX
13
1
0
1
(Reserved)
–
14
1
0
Fast PWM
ICRn
BOTTOM
TOP
15
1
Fast PWM
OCRnA
BOTTOM
TOP
Bit
765
4
3
2
1
0
ICNC1
ICES1
–
WGM13
WGM12
CS12
CS11
CS10
TCCR1B
Read/Write
R/W
R
R/W
Initial Value
0
Bit
765
4
3
2
1
0
ICNC3
ICES3
–
WGM33
WGM32
CS32
CS31
CS30
TCCR3B
Read/Write
R/W
R
R/W
Initial Value
0