atmega32c1 ATMEL Corporation, atmega32c1 Datasheet - Page 127

• Manufacturer Part Number: atmega32c1
• Description: Atmega32m1 Automotive 8-bit Avr Microcontroller With 32k/64k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

7647A–AVR–02/08
I/O pin it is connected to. However, note that the Data Direction Register (DDR) bit correspond-
ing to the OCnA or OCnB pin must be set in order to enable the output driver.
When the OCnA or OCnB is connected to the pin, the function of the COMnx1:0 bits is depen-
dent of the WGMn3:0 bits setting.
WGMn3:0 bits are set to a Normal or a CTC mode (non-PWM).
Table 13-1.
Table 13-2
PWM mode.
Table 13-2.
Note:
Table 13-3
correct or the phase and frequency correct, PWM mode.
Table 13-3.
COMnA1/COMnB1
COMnA1/COMnB1
COMnA1/COMnB1
1. A special case occurs when OCRnA/OCRnB equals TOP and COMnA1/COMnB1 is set. In
0
0
1
1
0
0
1
1
0
this case the compare match is ignored, but the set or clear is done at TOP.
Mode” on page 119.
shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the phase
shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast
Compare Output Mode, non-PWM
Compare Output Mode, Fast PWM
Compare Output Mode, Phase Correct and Phase and Frequency Correct
PWM
(1)
COMnA0/COMnB0
COMnA0/COMnB0
COMnA0/COMnB0
for more details.
0
1
0
1
0
1
0
1
0
Table 13-1
Description
Normal port operation, OCnA/OCnB disconnected.
Toggle OCnA/OCnB on Compare Match.
Clear OCnA/OCnB on Compare Match (Set output to
low level).
Set OCnA/OCnB on Compare Match (Set output to
high level).
Description
Normal port operation, OCnA/OCnB disconnected.
WGMn3:0 = 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 OCnA/OCnB on Compare Match, set
OCnA/OCnB at TOP
Set OCnA/OCnB on Compare Match, clear
OCnA/OCnB at TOP
Description
Normal port operation, OCnA/OCnB disconnected.
shows the COMnx1:0 bit functionality when the
(1)
ATmega32/64/M1/C1
See “Fast PWM
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