ATtiny261-ESSZ datasheet(118/227 Pages) ATMEL

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118

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

The automatic action programmed in COM1A1 and COM1A0 takes place as if a compare match

had occurred, but no interrupt is generated. The FOC1A bit is always read as zero.

• Bit 2 - FOC1B: Force Output Compare Match 1B

The FOC1B bit is only active when the PWM1B bit specify a non-PWM mode.

Writing a logical one to this bit forces a change in the Waveform Output (OCW1B) and the Out-

put Compare pin (OC1B) according to the values already set in COM1B1 and COM1B0. If

COM1B1 and COM1B0 written in the same cycle as FOC1B, 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. The automatic action programmed in COM1B1 and COM1B0 takes place as if a compare

match had occurred, but no interrupt is generated.

The FOC1B bit is always read as zero.

• Bit 1 - PWM1A: Pulse Width Modulator A Enable

When set (one) this bit enables PWM mode based on comparator OCR1A

• Bit 0 - PWM1B: Pulse Width Modulator B Enable

When set (one) this bit enables PWM mode based on comparator OCR1B.

16.11.2

TCCR1B – Timer/Counter1 Control Register B

• Bit 7 - PWM1X: PWM Inversion Mode

When this bit is set (one), the PWM Inversion Mode is selected and the Dead Time Generator

outputs, OC1x and OC1x are inverted.

• Bit 6 - PSR1: Prescaler Reset Timer/Counter1

When this bit is set (one), the Timer/Counter1 prescaler (TCNT1 is unaffected) will be reset. The

bit will be cleared by hardware after the operation is performed. Writing a zero to this bit will have

no effect. This bit will always read as zero.

• Bits 5,4 - DTPS11, DTPS10: Dead Time Prescaler Bits

The Timer/Counter1 Control Register B is a 8-bit read/write register.

The dedicated Dead Time prescaler in front of the Dead Time Generator can divide the

Timer/Counter1 clock (PCK or CK) by 1, 2, 4 or 8 providing a large range of dead times that can

be generated. The Dead Time prescaler is controlled by two bits DTPS11 and DTPS10 from the

Dead Time Prescaler register. These bits define the division factor of the Dead Time prescaler.

The division factors are given in Table 16-14.

Bit

76543210

0x2F (0x4F)

PWM1X

PSR1

DTPS11

DTPS10

CS13

CS12

CS11

CS10

TCCR1B

Read/Write

R/W

Initial value

00000000

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