ATtiny43U datasheet(91/182 Pages) ATMEL

91 / 182 page

8048B–AVR–03/09

Table 12-3 on page 91 shows the COMnA[1:0] bit functionality when the WGMn[1:0] bits are set

to fast PWM mode.

Note:

1. A special case occurs when OCRnA equals TOP and COMnA1 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 85

for more details.

Table 12-4 on page 91 shows the COMnA[1:0] bit functionality when the WGMn[2:0] bits are set

to phase correct PWM mode.

Note:

1. A special case occurs when OCRnA equals TOP and COMnA1 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 87 for more details.

• Bits 5:4 – COMnB[1:0]: Compare Match Output B Mode

These bits control the Output Compare pin (OCnB) behavior. If one or both of the COMnB1:0

bits are set, the OCnB 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 OCnB pin

must be set in order to enable the output driver.

When OCnB is connected to the pin, the function of the COMnB[1:0] bits depends on the

WGMn[2:0] bit setting. Table 12-5 on page 91 shows the COMnB[1:0] bit functionality when the

WGMn[2:0] bits are set to a normal or CTC mode (non-PWM).

Table 12-3.

Compare Output Mode, Fast PWM Mode(1)

COMnA1

COMnA0

Description

Normal port operation, OCnA disconnected.

WGMn2 = 0: Normal Port Operation, OCnA Disconnected.

WGMn2 = 1: Toggle OCnA on Compare Match.

Clear OCnA on Compare Match, set OCnA at TOP

Set OCnA on Compare Match, clear OCnA at TOP

Table 12-4.

Compare Output Mode, Phase Correct PWM Mode

(1)

COMnA1

COMnA0

Description

Normal port operation, OCnA disconnected.

WGMn2 = 0: Normal Port Operation, OCnA Disconnected.

WGMn2 = 1: Toggle OCnA on Compare Match.

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

Compare Match when down-counting.

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

Compare Match when down-counting.

Table 12-5.

Compare Output Mode, non-PWM Mode

COMnB1

COMnB0

Description

Normal port operation, OCnB disconnected.

Toggle OCnB on Compare Match

Clear OCnB on Compare Match

Set OCnB on Compare Match

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