ATEMGA128-16AI View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'ATEMGA128-16AI' PDF : 395 Pages View PDF
Table 59 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the
fast PWM mode
Table 59. Compare Output Mode, Fast PWM
COMnA1/COMnB1/
COMnC1
COMnA0/COMnB0/
COMnC0
Description
0
0
Normal port operation, OCnA/OCnB/OCnC
disconnected.
0
1
WGMn3:0 = 15: Toggle OCnA on Compare
Match, OCnB/OCnC disconnected (normal
port operation).
For all other WGMn settings, normal port
operation, OCnA/OCnB/OCnC
disconnected.
1
0
Clear OCnA/OCnB/OCnC on compare
match, set OCnA/OCnB/OCnC at BOTTOM,
(non-inverting mode)
1
1
Set OCnA/OCnB/OCnC on compare match,
clear OCnA/OCnB/OCnC at BOTTOM,
(inverting mode)
Note:
A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and
COMnA1/COMnB1/COMnC1 is set. In this case the compare match is ignored, but the
set or clear is done at BOTTOM. See “Fast PWM Mode” on page 124. for more details.
Table 59 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the
phase correct and frequency correct PWM mode.
Table 60. Compare Output Mode, Phase Correct and Phase and Frequency Correct
PWM
COMnA1/COMnB1/
COMnC1
COMnA0/COMnB0/
COMnC0
Description
0
0
Normal port operation, OCnA/OCnB/OCnC
disconnected.
0
1
WGMn3:0 = 9 or 14: Toggle OCnA on
Compare Match, OCnB/OCnC disconnected
(normal port operation).
For all other WGMn settings, normal port
operation, OCnA/OCnB/OCnC
disconnected.
1
0
Clear OCnA/OCnB/OCnC on compare
match when up-counting. Set
OCnA/OCnB/OCnC on compare match
when downcounting.
1
1
Set OCnA/OCnB/OCnC on compare match
when up-counting. Clear
OCnA/OCnB/OCnC on compare match
when downcounting.
Note:
A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and
COMnA1/COMnB1//COMnC1 is set. See “Phase Correct PWM Mode” on page 126. for
more details.
134 ATmega128
2467O–AVR–10/06
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