ATmega64A datasheet(134/392 Pages) ATMEL

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134

8160C–AVR–07/09

ATmega64A

Table 15-3 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the fast

PWM mode

Note:

1. 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 BOTTOM. See “Fast PWM Mode” on page 124. for more details.

Table 15-3 shows the COMnx1:0 bit functionality when the WGMn3:0 bits are set to the phase

correct and frequency correct PWM mode.

Note:

1. A special case occurs when OCRnA/OCRnB/OC

RnC equals TOP and

COMnA1/COMnB1/COMnC1 is set. See “Phase Correct PWM Mode” on page 126. for more

details.

• Bit 1:0 – WGMn1:0: Waveform Generation Mode

Combined with the WGMn3:2 bits found in the TCCRnB 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 15-5. 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. (See “Modes of Operation” on page 123.)

Table 15-3.

Compare Output Mode, Fast PWM(1)

COMnA1/

COMnB1/

COMnC0

COMnA0/

COMnB0/

COMnC0

Description

Normal port operation, OCnA/OCnB/OCnC disconnected.

WGMn3:0 = 15: Toggle OCnA on Compare Match, OCnB/OCnC

disconnected (normal port operation).

For all other WGMn settings, normal port operation,

OCnA/OCnB/OCnC disconnected.

Clear OCnA/OCnB/OCnC on Compare Match, set

OCnA/OCnB/OCnC at BOTTOM (non-inverting mode).

Set OCnA/OCnB/OCnC on Compare Match, clear

OCnA/OCnB/OCnC at BOTTOM (inverting mode).

Table 15-4.

Compare Output Mode, Phase Correct and Phase and Frequency Correct

PWM

(1)

COMnA1/

COMnB1/

COMnC1

COMnA0/

COMnB0/

COMnC0

Description

Normal port operation, OCnA/OCnB/OCnC disconnected.

WGMn3:0 = 9 or 11: Toggle OCnA on Compare Match, OCnB/OCnC

disconnected (normal port operation).

Forr all other WGMn settings, normal port operation,

OCnA/OCnB/OCnC disconnected.

Clear OCnA/OCnB/OCnC on Compare Match when up-counting. Set

OCnA/OCnB/OCnC on Compare Match when downcounting.

Set OCnA/OCnB/OCnC on Compare Match when up-counting. Clear

OCnA/OCnB/OCnC on Compare Match when downcounting.

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