AT90SCR100 datasheet(99/433 Pages) ATMEL

99 / 433 page

TPR0327AY–SMS–30Jan09

AT90SCR100

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

WGM02:0 bit setting. Table 13-2 shows the COM0A1:0 bit functionality when the WGM02:0 bits

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

Table 13-3 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 BOTTOM. See “Fast PWM Mode” on

page 94 for more details.

Table 13-4 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 95 for more details.

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

These bits control the Output Compare pin (OC0B) behavior. If one or both of the COM0B1:0

bits are set, the OC0B output overrides the normal port functionality of the I/O pin to which it is

Table 13-2.

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 13-3.

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 BOTTOM

(non-inverting mode)

Set OC0A on Compare Match, clear OC0A at BOTTOM

(inverting mode)

Table 13-4.

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.

AT90SCR100 Datasheet(PDF) 99 Page - ATMEL Corporation

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