ATtiny261A datasheet(111/292 Pages) ATMEL

111 / 292 page

111

8197A–AVR–10/09

ATtiny261A/461A/861A

Table 12-10 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits

are set to Phase and Frequency Correct PWM Mode.

Table 12-11 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 thw all OC1x and OC1x pins as described below.

Table 12-12 shows the COM1A1:0 bit functionality when the PWM1A, WGM10 and WGM11 bits

are set to dual-slope PWM6 Mode.I

Bits COM1A1 and COM1A0 are shadowed in TCCR1C. Writing to bits COM1A1 and COM1A0

will also change bits COM1A1S and COM1A0S in TCCR1C. Similary, changes written to bits

COM1A1S and COM1A0S in TCCR1C will show here. See “TCCR1C – Timer/Counter1 Control

Table 12-10. Compare Output Mode, Phase and Frequency Correct PWM Mode

COM1A1:0

OCW1A Behaviour

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 12-11. Compare Output Mode, Single-Slope PWM6 Mode

COM1A1:0

OCW1A Behaviour

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 12-12. Compare Output Mode, Dual-Slope PWM6 Mode

COM1A1:0

OCW1A Behaviour

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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