ATtiny5 datasheet(74/168 Pages) ATMEL

74 / 168 page

8127C–AVR–10/09

ATtiny4/5/9/10

When OC0A or OC0B is connected to the pin, the function of COM0x1:0 bits depends on the

WGM03:0 bits. Table 11-2 shows the COM0x1:0 bit functionality when the WGM03:0 bits are set

to a Normal or CTC (non-PWM) Mode.

Table 11-3 shows the COM0x1:0 bit functionality when the WGM03:0 bits are set to one of the

Fast PWM Modes.

Note:

1. A special case occurs when OCR0A/OCR0B equals TOP and COM0A1/COM0B1 is set. In

this case the compare match is ignored, but set or clear is done at BOTTOM. See “Fast PWM

Mode” on page 63 for more details.

Table 11-4 shows the COM0x1:0 bit functionality when the WGM03:0 bits are set to the phase

correct or the phase and frequency correct, PWM mode.

Note:

1. A special case occurs when OCR0A/OCR0B equals TOP and COM0A1/COM0B1 is set.

“Phase Correct PWM Mode” on page 65 for more details.

Table 11-2.

Compare Output in Non-PWM Modes

COM0A1/

COM0B1

COM0A0

COM0B0

Description

Normal port operation: OC0A/OC0B disconnected

Toggle OC0A/OC0B on compare match

Clear (set low) OC0A/OC0B on compare match

Set (high) OC0A/OC0B on compare match

Table 11-3.

Compare Output in Fast PWM Modes

COM0A1/

COM0B1

COM0A0/

COM0B0

Description

Normal port operation: OC0A/OC0B disconnected

WGM03 = 0: Normal port operation, OC0A/OC0B disconnected

WGM03 = 1: Toggle OC0A on compare match, OC0B reserved

1 (1)

Clear OC0A/OC0B on compare match

Set OC0A/OC0B at BOTTOM (non-inverting mode)

Set OC0A/OC0B on compare match

Clear OC0A/OC0B at BOTTOM (inverting mode)

Table 11-4.

Compare Output in Phase Correct and Phase & Frequency Correct PWM Modes

COM0A1/

COM0B1

COM0A0/

COM0B0

Description

Normal port operation: OC0A/OC0B disconnected.

WGM03 = 0: Normal port operation, OC0A/OC0B disconnected

WGM03 = 1: Toggle OC0A on compare match, OC0B reserved

1 (1)

Counting up: Clear OC0A/OC0B on compare match

Counting down: Set OC0A/OC0B on compare match

Counting up: Set OC0A/OC0B on compare match

Counting down: Clear OC0A/OC0B on compare match

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