130
9152BINDCO02/10
ATA8743
Table 21-3 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the phase
correct or the phase and frequency correct, PWM mode.
Note:
A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. Phase
Correct PWM Mode on page 122 for more details.
" Bit 1:0 WGM11:0: Waveform Generation Mode
Combined with the WGM13:2 bits found in the TCCR1B 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 21-4 on page 131. 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 Width Modulation (PWM) modes. ( Modes of Operation on page 119).
Table 21-3. Compare Output Mode, Phase Correct and Phase and Frequency Correct
PWM
(Note:)
COM1A1/COM1B1
COM1A0/COM1B0
Description
0
0
Normal port operation, OC1A/OC1B disconnected.
0
1
WGM13=0: Normal port operation, OC1A/OC1B
disconnected.
WGM13=1: Toggle OC1A on Compare Match, OC1B
reserved.
1
0
Clear OC1A/OC1B on Compare Match when
up-counting. Set OC1A/OC1B on Compare Match
when downcounting.
1
1
Set OC1A/OC1B on Compare Match when
up-counting. Clear OC1A/OC1B on Compare Match
when downcounting.
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