ATmega1284P datasheet(155/380 Pages) ATMEL

155 / 380 page

155

8059D–AVR–11/09

ATmega1284P

When OC2B is connected to the pin, the function of the COM2B1:0 bits depends on the

WGM22:0 bit setting. Table 15-5 shows the COM2B1:0 bit functionality when the WGM22:0 bits

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

Table 15-6 shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to fast PWM

mode.

Note:

1. A special case occurs when OCR2B equals TOP and COM2B1 is set. In this case, the Com-

pare Match is ignored, but the set or clear is done at BOTTOM. See ”Fast PWM Mode” on

page 146 for more details.

Table 15-7 shows the COM2B1:0 bit functionality when the WGM22:0 bits are set to phase cor-

rect PWM mode.

Note:

1. A special case occurs when OCR2B equals TOP and COM2B1 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 148 for more details.

• Bits 3:2 – Res: Reserved Bits

These bits are reserved bits in the ATmega1284P and will always read as zero.

Table 15-5.

Compare Output Mode, non-PWM Mode

COM2B1

COM2B0

Description

Normal port operation, OC2B disconnected.

Toggle OC2B on Compare Match

Clear OC2B on Compare Match

Set OC2B on Compare Match

Table 15-6.

Compare Output Mode, Fast PWM Mode

(1)

COM2B1

COM2B0

Description

Normal port operation, OC2B disconnected.

Reserved

Clear OC2B on Compare Match, set OC2B at BOTTOM,

(non-inverting mode).

Set OC2B on Compare Match, clear OC2B at BOTTOM,

(inverting mode).

Table 15-7.

Compare Output Mode, Phase Correct PWM Mode(1)

COM2B1

COM2B0

Description

Normal port operation, OC2B disconnected.

Reserved

Clear OC2B on Compare Match when up-counting. Set OC2B on

Compare Match when down-counting.

Set OC2B on Compare Match when up-counting. Clear OC2B on

Compare Match when down-counting.

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