ATmega32A datasheet(113/352 Pages) ATMEL

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8155B–AVR–07/09

ATmega32A

Table 16-3 shows the COM1x1:0 bit functionality when the WGM13:0 bits are set to the fast

PWM mode.

Note:

1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 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 104. for more details.

Table 16-4 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:

1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set. See

“Phase Correct PWM Mode” on page 106. for more details.

• Bit 3 – FOC1A: Force Output Compare for Compare unit A

• Bit 2 – FOC1B: Force Output Compare for Compare unit B

The FOC1A/FOC1B bits are only active when the WGM13:0 bits specifies a non-PWM mode.

However, for ensuring compatibility with future devices, these bits must be set to zero when

Table 16-3.

Compare Output Mode, Fast PWM

(1)

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B

disconnected.

WGM13:0 = 15: Toggle OC1A on Compare

Match, OC1B disconnected (normal port

operation).

For all other WGM13:0 settings, normal port

operation, OC1A/OC1B disconnected.

Clear OC1A/OC1B on compare match, set

OC1A/OC1B at BOTTOM,

(non-inverting mode)

Set OC1A/OC1B on compare match, clear

OC1A/OC1B at BOTTOM,

(inverting mode)

Table 16-4.

Compare Output Mode, Phase Correct and Phase and Frequency Correct PWM

(1)

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B

disconnected.

WGM13:0 = 9 or 14: Toggle OC1A on

Compare Match, OC1B disconnected (normal

port operation).

For all other WGM13:0 settings, normal port

operation, OC1A/OC1B disconnected.

Clear OC1A/OC1B on compare match when

up-counting. Set OC1A/OC1B on compare

match when downcounting.

Set OC1A/OC1B on compare match when up-

counting. Clear OC1A/OC1B on compare

match when downcounting.

ATmega32A Datasheet(PDF) 113 Page - ATMEL Corporation

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