AT90PWM3 datasheet(96/361 Pages) ATMEL

96 / 361 page

4317J–AVR–08/10

AT90PWM2/3/2B/3B

• Bits 7:6 – COM0A1:0: Compare Match Output A Mode

These bits control the Output Compare pin (OC0A) behavior. If one or both of the COM0A1:0

bits are set, the OC0A output overrides the normal port functionality of the I/O pin it is connected

to. However, note that the Data Direction Register (DDR) bit corresponding to the OC0A pin

must be set in order to enable the output driver.

When OC0A is connected to the pin, the function of the COM0A1:0 bits depends on the

WGM02:0 bit setting. Table 14-2 shows the COM0A1:0 bit functionality when the WGM02:0 bits

are set to a normal or CTC mode (non-PWM).

Table 14-3 shows the COM0A1:0 bit functionality when the WGM01:0 bits are set to fast PWM

mode.

Note:

1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Com-

pare Match is ignored, but the set or clear is done at TOP. See “Fast PWM Mode” on page 91

for more details.

Table 14-4 shows the COM0A1:0 bit functionality when the WGM02:0 bits are set to phase cor-

rect PWM mode.

Note:

1. A special case occurs when OCR0A equals TOP and COM0A1 is set. In this case, the Com-

pare Match is ignored, but the set or clear is done at TOP. See “Phase Correct PWM Mode” on

page 117 for more details.

• Bits 5:4 – COM0B1:0: Compare Match Output B Mode

Table 14-2.

Compare Output Mode, non-PWM Mode

COM0A1

COM0A0

Description

Normal port operation, OC0A disconnected.

Toggle OC0A on Compare Match

Clear OC0A on Compare Match

Set OC0A on Compare Match

Table 14-3.

Compare Output Mode, Fast PWM Mode(1)

COM0A1

COM0A0

Description

Normal port operation, OC0A disconnected.

WGM02 = 0: Normal Port Operation, OC0A Disconnected.

WGM02 = 1: Toggle OC0A on Compare Match.

Clear OC0A on Compare Match, set OC0A at TOP

Set OC0A on Compare Match, clear OC0A at TOP

Table 14-4.

Compare Output Mode, Phase Correct PWM Mode

(1)

COM0A1

COM0A0

Description

Normal port operation, OC0A disconnected.

WGM02 = 0: Normal Port Operation, OC0A Disconnected.

WGM02 = 1: Toggle OC0A on Compare Match.

Clear OC0A on Compare Match when up-counting. Set OC0A on

Compare Match when down-counting.

Set OC0A on Compare Match when up-counting. Clear OC0A on

Compare Match when down-counting.

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