101
9152BINDCO02/10
ATA8743
Table 20-4 on page 101 shows the COM0A1:0 bit functionality when the WGM02:0 bits are set
to phase correct PWM mode.
Note:
1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Com-
pare Match is ignored, but the set or clear is done at TOP . See Phase Correct PWM Mode on
page 97 for more details.
" 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 corresponding 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 20-2 on page 100 shows the COM0A1:0 bit functionality when the
WGM02:0 bits are set to a normal or CTC mode (non-PWM).
Table 20-3 on page 100 shows the COM0B1:0 bit functionality when the WGM02:0 bits are set
to fast PWM mode.
Table 20-4. Compare Output Mode, Phase Correct PWM Mode
(1)
COM0A1
COM0A0
Description
0
0
Normal port operation, OC0A disconnected.
0
1
WGM02 = 0: Normal Port Operation, OC0A Disconnected.
WGM02 = 1: Toggle OC0A on Compare Match.
1
0
Clear OC0A on Compare Match when up-counting. Set OC0A on
Compare Match when down-counting.
1
1
Set OC0A on Compare Match when up-counting. Clear OC0A on
Compare Match when down-counting.
Table 20-5. Compare Output Mode, non-PWM Mode
COM01
COM00
Description
0
0
Normal port operation, OC0B disconnected.
0
1
Toggle OC0B on Compare Match
1
0
Clear OC0B on Compare Match
1
1
Set OC0B on Compare Match
Table 20-6. Compare Output Mode, Fast PWM Mode
(1)
COM01
COM00
Description
0
0
Normal port operation, OC0B disconnected.
0
1
Reserved
1
0
Clear OC0B on Compare Match, set OC0B at BOTTOM
(non-inverting mode)
1
1
Set OC0B on Compare Match, clear OC0B at BOTTOM
(inverting mode)
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