ATMEGA325-16AJ ATMEL [ATMEL Corporation], ATMEGA325-16AJ Datasheet - Page 118

• Manufacturer Part Number: ATMEGA325-16AJ
• Description: 8-bit Microcontroller with In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

118
ATmega325/3250/645/6450
Table 54 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the
fast PWM mode.
Table 54. Compare Output Mode, Fast PWM
Note:
Table 55 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.
Table 55. Compare Output Mode, Phase Correct and Phase and Frequency Correct
PWM
Note:
• 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 waveform generation to be used, see Table 56. Modes of operation sup-
ported 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. (See
“Modes of Operation” on page 108.).
COM1A1/COM1B1
COM1A1/COM1B1
(1)
1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is
1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is
0
0
1
1
0
0
1
1
set. In this case the compare match is ignored, but the set or clear is done at TOP.
See “Fast PWM Mode” on page 109. for more details.
set. See “Phase Correct PWM Mode” on page 111. for more details.
COM1A0/COM1B0
COM1A0/COM1B0
0
1
0
1
0
1
0
1
Description
Normal port operation, OC1A/OC1B
disconnected.
WGM13:0 = 14 or 15: Toggle OC1A on Compare
Match, OC1B disconnected (normal port
operation). For all other WGM1 settings, normal
port operation, OC1A/OC1B disconnected.
Clear OC1A/OC1B on Compare Match, set
OC1A/OC1B at TOP
Set OC1A/OC1B on Compare Match, clear
OC1A/OC1B at TOP
Description
Normal port operation, OC1A/OC1B
disconnected.
WGM13:0 = 8, 9, 10 or 11: Toggle OC1A on
Compare Match, OC1B disconnected (normal
port operation). For all other WGM1 settings,
normal port operation, OC1A/OC1B
disconnected.
Clear OC1A/OC1B on Compare Match when up-
counting. Set OC1A/OC1B on Compare Match
when counting down.
Set OC1A/OC1B on Compare Match when up-
counting. Clear OC1A/OC1B on Compare Match
when counting down.
(1)
2570A–AVR–09/04