12.8.7 Timer/Counter 0 Interrupt Flag Register – TIFR0
Bit
7
–
6
–
5
–
4
–
3
–
2
1
0
TOV0
R/W
0
OCF0B OCF0A
TIFR0
Read/Write
Initial Value
R
0
R
0
R
0
R
0
R
0
R/W
0
R/W
0
• Bits 7..3 – Res: Reserved Bits
These bits are reserved bits in the ATmega16/32/64/M1/C1 and will always read as zero.
• Bit 2 – OCF0B: Timer/Counter 0 Output Compare B Match Flag
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 corresponding 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 1 – OCF0A: Timer/Counter 0 Output Compare A Match Flag
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 corresponding 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 0 – 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 12-8, “Waveform Generation Mode Bit
Description” on page 88.
ATmega16/32/64/M1/C1 [DATASHEET]
91
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
