ATmega16 datasheet(84/357 Pages) ATMEL

84 / 357 page

2466S–AVR–05/09

ATmega16(L)

When OC0 is connected to the pin, the function of the COM01:0 bits depends on the WGM01:0

bit setting. Table 39 shows the COM01:0 bit functionality when the WGM01:0 bits are set to a

normal or CTC mode (non-PWM).

Table 40 shows the COM01:0 bit functionality when the WGM01:0 bits are set to fast PWM

mode.

Note:

1. A special case occurs when OCR0 equals TOP and COM01 is set. In this case, the compare

match is ignored, but the set or clear is done at TOP. See “Fast PWM Mode” on page 77 for

more details.

Table 41 shows the COM01:0 bit functionality when the WGM01:0 bits are set to phase correct

PWM mode.

Note:

1. A special case occurs when OCR0 equals TOP and COM01 is set. In this case, the compare

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

79 for more details.

Table 39. Compare Output Mode, non-PWM Mode

COM01

COM00

Description

Normal port operation, OC0 disconnected.

Toggle OC0 on compare match

Clear OC0 on compare match

Set OC0 on compare match

Table 40. Compare Output Mode, Fast PWM Mode

(1)

COM01

COM00

Description

Normal port operation, OC0 disconnected.

Reserved

Clear OC0 on compare match, set OC0 at BOTTOM,

(non-inverting mode)

Set OC0 on compare match, clear OC0 at BOTTOM,

(inverting mode)

Table 41. Compare Output Mode, Phase Correct PWM Mode(1)

COM01

COM00

Description

Normal port operation, OC0 disconnected.

Reserved

Clear OC0 on compare match when up-counting. Set OC0 on compare

match when downcounting.

Set OC0 on compare match when up-counting. Clear OC0 on compare

match when downcounting.

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