ATmega16U4 datasheet(130/408 Pages) ATMEL

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130

7766D–AVR–01/09

ATmega16U4/ATmega32U4

Table 14-2 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast

PWM mode.

Note:

A special case occurs when OCRnA/OCRnB/OCRnC equals TOP and

COMnA1/COMnB1/COMnC1 is set. In this case the compare match is ignored, but the set or clear

is done at TOP. See “Fast PWM Mode” on page 96. for more details.

Table 14-3 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the phase

correct and frequency correct PWM mode.

Table 14-1.

Compare Output Mode, non-PWM

COMnA1/COMnB1/

COMnC1

COMnA0/COMnB0/

COMnC0

Description

Normal port operation, OCnA/OCnB/OCnC

disconnected.

Toggle OCnA/OCnB/OCnC on compare

match.

Clear OCnA/OCnB/OCnC on compare

match (set output to low level).

Set OCnA/OCnB/OCnC on compare match

(set output to high level).

Table 14-2.

Compare Output Mode, Fast PWM

COMnA1/COMnB1/

COMnC0

COMnA0/COMnB0/

COMnC0

Description

Normal port operation, OCnA/OCnB/OCnC

disconnected.

WGM13:0 = 14 or 15: Toggle OC1A on

Compare Match, OC1B and OC1C

disconnected (normal port operation). For all

other WGM1 settings, normal port operation,

OC1A/OC1B/OC1C disconnected.

Clear OCnA/OCnB/OCnC on compare

match, set OCnA/OCnB/OCnC at TOP

Set OCnA/OCnB/OCnC on compare match,

clear OCnA/OCnB/OCnC at TOP

ATmega16U4 Datasheet(PDF) 130 Page - ATMEL Corporation

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