ATtiny44 datasheet(109/236 Pages) ATMEL

109 / 236 page

109

8006H–AVR–10/09

ATtiny24/44/84

Table 12-3 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. “Fast PWM

Mode” on page 97 for more details.

Table 12-4 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.

“Phase Correct PWM Mode” on page 99 for more details.

Table 12-2.

Compare Output Mode, non-PWM

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B disconnected.

Toggle OC1A/OC1B on Compare Match.

Clear OC1A/OC1B on Compare Match (Set output to

low level).

Set OC1A/OC1B on Compare Match (Set output to

high level).

Table 12-3.

Compare Output Mode, Fast PWM(1)

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B disconnected.

WGM13=0: Normal port operation, OC1A/OC1B

disconnected.

WGM13=1: Toggle OC1A on Compare Match, OC1B

reserved.

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 12-4.

Compare Output Mode, Phase Correct and Phase & Frequency Correct PWM(1)

COM1A1/COM1B1

COM1A0/COM1B0

Description

Normal port operation, OC1A/OC1B disconnected.

WGM13=0: Normal port operation, OC1A/OC1B

disconnected.

WGM13=1: Toggle OC1A on Compare Match, OC1B

reserved.

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.

ATtiny44 Datasheet(PDF) 109 Page - ATMEL Corporation

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