ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 131
ATMEGA2561V
Manufacturer Part Number
ATMEGA2561V
Description
8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATMEGA2561V.pdf
(449 pages)
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2549K–AVR–01/07
Table 75. Compare Output Mode, Phase Correct PWM Mode
Note:
• Bits 5:4 – COM0B1:0: Compare Match Output B Mode
These bits control the Output Compare pin (OC0B) behavior. If one or both of the
COM0B1:0 bits are set, the OC0B output overrides the normal port functionality of the
I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit cor-
responding to the OC0B pin must be set in order to enable the output driver.
When OC0B is connected to the pin, the function of the COM0B1:0 bits depends on the
WGM02:0 bit setting. Table 73 shows the COM0A1:0 bit functionality when the
WGM02:0 bits are set to a normal or CTC mode (non-PWM).
Table 76. Compare Output Mode, non-PWM Mode
Table 74 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set to fast
PWM mode.
Table 77. Compare Output Mode, Fast PWM Mode
Note:
COM0A1
COM0B1
COM0B1
0
0
1
1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case,
1. A special case occurs when OCR0B equals TOP and COM0B1 is set. In this case,
the Compare Match is ignored, but the set or clear is done at TOP. See “Phase Cor-
rect PWM Mode” on page 126 for more details.
the Compare Match is ignored, but the set or clear is done at BOTTOM. See “Fast
PWM Mode” on page 125 for more details.
COM0A0
COM0B0
COM0B0
0
1
0
1
0
1
0
1
0
1
0
1
ATmega640/1280/1281/2560/2561
Description
Normal port operation, OC0A disconnected.
WGM02 = 0: Normal Port Operation, OC0A Disconnected.
WGM02 = 1: Toggle OC0A on Compare Match.
Clear OC0A on Compare Match when up-counting. Set OC0A on
Compare Match when down-counting.
Set OC0A on Compare Match when up-counting. Clear OC0A on
Compare Match when down-counting.
Description
Normal port operation, OC0B disconnected.
Toggle OC0B on Compare Match
Clear OC0B on Compare Match
Set OC0B on Compare Match
Description
Normal port operation, OC0B disconnected.
Reserved
Clear OC0B on Compare Match, set OC0B at BOTTOM,
(non-inverting mode).
Set OC0B on Compare Match, clear OC0B at BOTTOM,
(inverting mode).
(1)
(1)
131
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