Rainbow Electronics ATtiny2313 - Manual (Page 80)

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ATtiny2313
2543A–AVR–08/03
• 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 Tim er/Counter0 occurs, i.e., w hen the TOV0 bit is set in the
Timer/Counter 0 Interrupt Flag Register – TIFR.
• Bit 0 – 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 – TIFR.
Timer/Counter Interrupt Flag
Register – TIFR
• Bits 4, 0 – Res: Reserved Bits
These bits are reserved bits in the ATtiny2313 and will always read as zero.
• Bit 2 – 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 corresponding interrupt handling vector. Alternatively, OCF0B is
cle are d by w riting a logic one to the flag. When the I-bit in SRE G, OC IE 0B
(Timer/Counter Compare B Match Interrupt Enable), and OCF0B are set, the
Timer/Counter 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 41,
“Waveform Generation Mode Bit Description” on page 77.
• Bit 0 – 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 A. 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 , O CIE 0A
(Timer/Counter0 Compare Match Interrupt Enable), and OCF0A are set, the
Timer/Counter0 Compare Match Interrupt is executed.
Bit 7 6 5 4 3 2 1 0
TOV1 OCF1A OCF1B – ICF1 OCF0B TOV0 OCF0A TIFR
Read/Write R R R R R/W R/W R/W R
Initial Value 0 0 0 0 0 0 0 0