ATtiny261-ESSZ datasheet(117/227 Pages) ATMEL

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117

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Note that the Data Direction Register (DDR) bit corresponding to the OC1B pin must be set in

order to enable the output driver.

The function of the COM1B1:0 bits depends on the PWM1B and WGM10 bit settings. Table

16-11 shows the COM1B1:0 bit functionality when the PWM1B bit is set to Normal Mode

(non-PWM).

Table 16-12 shows the COM1B1:0 bit functionality when the PWM1B and WGM10 bits are set to

Fast PWM Mode.

Table 16-13 shows the COM1B1:0 bit functionality when the PWM1B and WGM10 bits are set to

Phase and Frequency Correct PWM Mode.

• Bit 3 - FOC1A: Force Output Compare Match 1A

The FOC1A bit is only active when the PWM1A bit specify a non-PWM mode.

Writing a logical one to this bit forces a change in the Waveform Output (OCW1A) and the Out-

put Compare pin (OC1A) according to the values already set in COM1A1 and COM1A0. If

COM1A1 and COM1A0 written in the same cycle as FOC1A, the new settings will be used. The

Force Output Compare bit can be used to change the output pin value regardless of the timer

value.

Table 16-11. Compare Output Mode, Normal Mode (non-PWM)

COM1B1..0

OCW1B Behavior

OC1B Pin

Normal port operation.

Disconnected

Toggle on Compare Match.

Connected

Disconnected

Clear on Compare Match.

Connected

Disconnected

Set on Compare Match.

Connected

Disconnected

Table 16-12. Compare Output Mode, Fast PWM Mode

COM1B1..0

OCW1B Behavior

OC1B Pin

Normal port operation.

Disconnected

Cleared on Compare Match.

Set when TCNT1 = 0x000.

Connected

Cleared on Compare Match.

Set when TCNT1 = 0x000.

Connected

Disconnected

Set on Compare Match.

Cleared when TCNT1 = 0x000.

Connected

Disconnected

Table 16-13. Compare Output Mode, Phase and Frequency Correct PWM Mode

COM1B1..0

OCW1B Behavior

OC1B Pin

Normal port operation.

Disconnected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

Connected

Disconnected

Set on Compare Match when up-counting.

Cleared on Compare Match when down-counting.

Connected

Disconnected

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