ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 108

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

15.9.5
8285D–AVR–06/11
TIFR0 – Timer/Counter 0 Interrupt Flag Register
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
if a compare match in Timer/Counter0 occurs, i.e., when the OCF0A bit is set in the Timer/Coun-
ter 0 Interrupt Flag Register – TIFR0.
• Bit 0 – TOIE0: Timer/Counter0 Overflow Interrupt Enable
When the TOIE0 bit is written to one, and the I-bit in the Status Register is set (one), 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.
• Bit 1 – OCF0A: Output Compare Flag 0 A
The OCF0A bit is set (one) 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 (one), the Timer/Counter0 Compare match Interrupt is executed.
• Bit 0 – TOV0: Timer/Counter0 Overflow Flag
The bit TOV0 is set (one) when an overflow occurs in Timer/Counter0. TOV0 is cleared by hard-
ware 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 Inter-
rupt Enable), and TOV0 are set (one), the Timer/Counter0 Overflow interrupt is executed. In
phase correct PWM mode, this bit is set when Timer/Counter0 changes counting direction at
0x00.
Bit
0x15 (0x35)
Read/Write
Initial Value
R
7
–
0
R
6
–
0
R
5
–
0
R
4
–
0
R
3
–
0
R
2
–
0
OCF0A
R/W
1
0
TOV0
R/W
0
0
TIFR0
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