ATtiny261A datasheet(115/292 Pages) ATMEL

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8197A–AVR–10/09

ATtiny261A/461A/861A

12.12.3

TCCR1C – Timer/Counter1 Control Register C

• Bits 7,6 - COM1A1S, COM1A0S: Comparator A Output Mode, Shadow Bits 1 and 0

These are shadow bits of COM1A1 and COM1A0 in TCCR1A. Writing to bits COM1A1S and

COM1A0S will also change bits COM1A1 and COM1A0 in TCCR1A. Similary, changes written

to bits COM1A1 and COM1A0 in TCCR1A will show here.

See “TCCR1A – Timer/Counter1 Control Register A” on page 110 for information on bit usage.

• Bits 5,4 - COM1B1S, COM1B0S: Comparator B Output Mode, Shadow Bits 1 and 0

These are shadow bits of COM1B1 and COM1B0 in TCCR1A. Writing to bits COM1B1S and

COM1B0S will also change bits COM1B1 and COM1B0 in TCCR1A. Similary, changes written

to bits COM1B1 and COM1B0 in TCCR1A will show here.

See “TCCR1A – Timer/Counter1 Control Register A” on page 110 for information on bit usage.

• Bits 3,2 - COM1D1, COM1D0: Comparator D Output Mode, Bits 1 and 0

These bits control the behaviour of the Waveform Output (OCW1D) and the connection of the

Output Compare pin (OC1D). If one or both of the COM1D1:0 bits are set, the OC1D output

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

OC1D output is connected only in PWM modes when the COM1D1:0 bits are set to “01”. Note

that the Data Direction Register (DDR) bit corresponding to the OC1D pin must be set in order to

enable the output driver.

The function of the COM1D1:0 bits depends on the PWM1D and WGM11:10 bit settings. Table

12-18 shows the COM1D1:0 bit functionality when the PWM1D bit is set to a Normal Mode (non-

PWM).

Table 12-19 shows the COM1D1:0 bit functionality when the PWM1D and WGM11:10 bits are

set to Fast PWM Mode.

Bit

7654

0x27 (0x47)

COM1A1S

COM1A0S

COM1B1S

COM1B0S

COM1D1

COM1D0

FOC1D

PWM1D

TCCR1C

Read/Write

R/W

Initial value

0000

Table 12-18. Compare Output Mode, Normal Mode (non-PWM)

COM1D1:0

OCW1D Behaviour

OC1D Pin

Normal port operation.

Disconnected

Toggle on Compare Match.

Connected

Disconnected

Clear on Compare Match.

Connected

Disconnected

Set on Compare Match.

Connected

Disconnected

Table 12-19. Compare Output Mode, Fast PWM Mode

COM1D1:0

OCW1D Behaviour

OC1D 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

ATtiny261A Datasheet(PDF) 115 Page - ATMEL Corporation

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