ATtiny13A datasheet(76/174 Pages) ATMEL

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8126D–AVR–11/09

ATtiny13A

11.9.7

TIFR0 – Timer/Counter 0 Interrupt Flag Register

• Bits 7:4, 0 – Res: Reserved Bits

These bits are reserved bits in the ATtiny13A and will always read as zero.

• Bit 3 – OCF0B: Output Compare Flag 0 B

The OCF0B bit is set when a Compare Match occurs between the Timer/Counter and the data in

OCR0B – Output Compare Register0 B. OCF0B is cleared by hardware when executing the cor-

responding interrupt handling vector. Alternatively, OCF0B is cleared by writing a logic one to

the flag. When the I-bit in SREG, OCIE0B (Timer/Counter Compare B Match Interrupt Enable),

and OCF0B are set, the Timer/Counter Compare Match Interrupt is executed.

• Bit 2 – OCF0A: Output Compare Flag 0 A

The OCF0A bit is set when a Compare Match occurs between the Timer/Counter0 and the data

in OCR0A – Output Compare Register0. OCF0A is cleared by hardware when executing the cor-

responding interrupt handling vector. Alternatively, OCF0A is cleared by writing a logic one to

the flag. When the I-bit in SREG, OCIE0A (Timer/Counter0 Compare Match Interrupt Enable),

and OCF0A are set, the Timer/Counter0 Compare Match Interrupt is executed.

• Bit 1 – TOV0: Timer/Counter0 Overflow Flag

The bit TOV0 is set when an overflow occurs in Timer/Counter0. TOV0 is cleared by hardware

when executing the corresponding interrupt handling vector. Alternatively, TOV0 is cleared by

writing a logic one to the flag. When the SREG I-bit, TOIE0 (Timer/Counter0 Overflow Interrupt

Enable), and TOV0 are set, the Timer/Counter0 Overflow interrupt is executed.

The setting of this flag is dependent of the WGM02:0 bit setting. Refer to Table 11-8, “Waveform

Generation Mode Bit Description” on page 73.

Bit

65432

0x38

–

OCF0B

OCF0A

TOV0

–TIFR0

Read/Write

R/W

Initial Value

00000

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