ATtiny25-15ST datasheet(77/196 Pages) ATMEL

77 / 196 page

7598H–AVR–07/09

ATtiny25/45/85

12.8.5

Output Compare Register B – OCR0B

The Output Compare Register B contains an 8-bit value that is continuously compared with the

counter value (TCNT0). A match can be used to generate an Output Compare interrupt, or to

generate a waveform output on the OC0B pin.

12.8.6

Timer/Counter Interrupt Mask Register – TIMSK

• Bits 7..4, 0 – Res: Reserved Bits

These bits are reserved bits in the ATtiny25/45/85 and will always read as zero.

• Bit 3 – OCIE0B: Timer/Counter Output Compare Match B Interrupt Enable

When the OCIE0B bit is written to one, and the I-bit in the Status Register is set, the

Timer/Counter Compare Match B interrupt is enabled. The corresponding interrupt is executed if

a Compare Match in Timer/Counter occurs, i.e., when the OCF0B bit is set in the Timer/Counter

Interrupt Flag Register – TIFR0.

• Bit 2 – OCIE0A: Timer/Counter0 Output Compare Match A Interrupt Enable

When the OCIE0A bit is written to one, and the I-bit in the Status Register is set, the

Timer/Counter0 Compare Match A interrupt is enabled. The corresponding interrupt is executed

if a Compare Match in Timer/Counter0 occurs, i.e., when the OCF0A bit is set in the

Timer/Counter 0 Interrupt Flag Register – TIFR0.

• Bit 1 – TOIE0: Timer/Counter0 Overflow Interrupt Enable

When the TOIE0 bit is written to one, and the I-bit in the Status Register is set, the

Timer/Counter0 Overflow interrupt is enabled. The corresponding interrupt is executed if an

overflow in Timer/Counter0 occurs, i.e., when the TOV0 bit is set in the Timer/Counter 0 Inter-

rupt Flag Register – TIFR0.

12.8.7

Timer/Counter 0 Interrupt Flag Register – TIFR

• Bits 7, 0 – Res: Reserved Bits

These bits are reserved bits in the ATtiny25/45/85 and will always read as zero.

Bit

765

432

OCR0B[7:0]

OCR0B

Read/Write

R/W

Initial Value

Bit

7654

–

OCIE1A

OCIE1B

OCIE0A

OCIE0B

TOIE1

TOIE0

–

TIMSK

Read/Write

R/W

Initial Value

0000

Bit

765

432

–

OCF1A

OCF1B

OCF0A

OCF0B

TOV1

TOV0

–TIFR

Read/Write

R/W

Initial Value

ATtiny25-15ST Datenblatt(PDF) 77 Page - ATMEL Corporation

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