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ATmega128
? Bit 1:0 – WGMn1:0: Waveform Generation Mode
Combined with the W GMn3:2 bits found in the TCCRnB Register, these bits control the counting
sequence of the counter, the source for maximum (TOP) counter value, and what type of wave-
form generation to be used, see Table 61 . Modes of operation supported by the Timer/Counter
unit are: Normal mode (counter), Clear Timer on Compare match (CTC) mode, and three types
of Pulse W idth Modulation (P W M) modes. ( See “Modes of Operation” on page 123. )
Table 61. W aveform Generation Mode Bit Description
WGMn2
WGMn1
WGMn0
Timer/Counter Mode of
Update of
TOVn Flag
Mode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
WGMn3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
(CTCn)
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
(PWMn1)
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
(PWMn0)
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Operation (1)
Normal
P W M, Phase Correct, 8-bit
P W M, Phase Correct, 9-bit
P W M, Phase Correct, 10-bit
CTC
Fast P W M, 8-bit
Fast P W M, 9-bit
Fast P W M, 10-bit
P W M, Phase and Frequency
Correct
P W M, Phase and Frequency
Correct
P W M, Phase Correct
P W M, Phase Correct
CTC
(Reserved)
Fast P W M
TOP
0xFFFF
0x00FF
0x01FF
0x03FF
OCRnA
0x00FF
0x01FF
0x03FF
ICRn
OCRnA
ICRn
OCRnA
ICRn
–
ICRn
OCRn x at
Immediate
TOP
TOP
TOP
Immediate
BOTTOM
BOTTOM
BOTTOM
BOTTOM
BOTTOM
TOP
TOP
Immediate
–
BOTTOM
Set on
MAX
BOTTOM
BOTTOM
BOTTOM
MAX
TOP
TOP
TOP
BOTTOM
BOTTOM
BOTTOM
BOTTOM
MAX
–
TOP
15
Note:
1 1 1 1 Fast P W M OCRnA BOTTOM TOP
1. The CTCn and P W Mn1:0 bit definition names are obsolete. Use the W GM n2:0 definitions. However, the functionality and
location of these bits are compatible with previous versions of the timer.
134
2467X–AVR–06/11
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