ATtiny261-ESSZ datasheet(116/227 Pages) ATMEL

116 / 227 page

116

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

Table 16-8 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits

are set to Phase and Frequency Correct PWM Mode.

Table 16-9 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits

are set to single-slope PWM6 Mode. In the PWM6 Mode the same Waveform Output (OCW1A)

is used for generating all waveforms and the Output Compare values OC1A and OC1A are con-

nected on the all OC1x and OC1x pins as described below.

Table 16-10 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits

are set to dual-slope PWM6 Mode.I

• Bits 5,4 - COM1B1, COM1B0: Comparator B Output Mode, Bits 1 and 0

These bits control the Behavior of the Waveform Output (OCW1B) and the connection of the

Output Compare pin (OC1B). If one or both of the COM1B1:0 bits are set, the OC1B output

overrides the normal port functionality of the I/O pin it is connected to. The complementary

OC1B output is connected only in PWM modes when the COM1B1:0 bits are set to “01”.

Table 16-8.

Compare Output Mode, Phase and Frequency Correct PWM Mode

COM1A1..0

OCW1A Behavior

OC1A 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

Table 16-9.

Compare Output Mode, Single-Slope PWM6 Mode

COM1A1..0

OCW1A Behavior

OC1x Pin

Normal port operation.

Disconnected

Cleared on Compare Match.

Set when TCNT1 = 0x000.

OC1A

Cleared on Compare Match.

Set when TCNT1 = 0x000.

OC1A

Set on Compare Match.

Cleared when TCNT1 = 0x000.

OC1A

Table 16-10. Compare Output Mode, Dual-Slope PWM6 Mode

COM1A1..0

OCW1A Behavior

OC1x Pin

Normal port operation.

Disconnected

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

OC1A

Cleared on Compare Match when up-counting.

Set on Compare Match when down-counting.

OC1A

Set on Compare Match when up-counting.

Cleared on Compare Match when down-counting.

OC1A

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