Rainbow Electronics ATmega128RFA1 - Manual (Page 324)

324
8266A-MCU Wireless-12/09
ATmega128RFA1
• Bit 1 – OCIE2A - Timer/Counter2 Output Compare Match A Interrupt Enable
When the OCIE2A bit is written to one and the I-bit in the Status Register is set (one),
the Timer/Counter2 Compare Match A interrupt is enabled. The corresponding interrupt
is executed if a compare match in Timer/Counter2 occurs, i.e., when the OCF2A bit is
set in the Timer/Counter2 Interrupt Flag Register TIFR2.
• Bit 0 – TOIE2 - Timer/Counter2 Overflow Interrupt Enable
When the TOIE2 bit is written to one and the I-bit in the Status Register is set (one), the
Timer/Counter2 Overflow interrupt is enabled. The corresponding interrupt is executed
if an overflow in Timer/Counter2 occurs i.e., when the TOV2 bit is set in the
Timer/Counter2 Interrupt Flag Register TIFR2.
21.11.2 TIFR2 – Timer/Counter Interrupt Flag Register
Bit 7 6 5 4 3 2 1 0
$17 ($37) Res4 Res3 Res2 Res1 Res0 OCF2B OCF2A TOV2 TIFR2
Read/Write R R R R R RW RW RW
Initial Value 0 0 0 0 0 0 0 0
• Bit 7:3 – Res4:0 - Reserved Bit
This bit is reserved for future use. A read access always will return zero. A write access
does not modify the content.
• Bit 2 – OCF2B - Output Compare Flag 2 B
The OCF2B bit is set (one) when a compare match occurs between the Timer/Counter2
and the data in OCR2B Output Compare Register2. OCF2B is cleared by hardware
when executing the corresponding interrupt handling vector. Alternatively, OCF2B is
cleared by writing a logic one to the flag. When the I-bit in SREG, OCIE2B
(Timer/Counter2 Compare Match Interrupt Enable), and OCF2B are set (one), the
Timer/Counter2 Compare Match Interrupt is executed.
• Bit 1 – OCF2A - Output Compare Flag 2 A
The OCF2A bit is set (one) when a compare match occurs between the Timer/Counter2
and the data in OCR2A Output Compare Register2. OCF2A is cleared by hardware
when executing the corresponding interrupt handling vector. Alternatively, OCF2A is
cleared by writing a logic one to the flag. When the I-bit in SREG, OCIE2A
(Timer/Counter2 Compare Match Interrupt Enable), and OCF2A are set (one), the
Timer/Counter2 Compare Match Interrupt is executed.
• Bit 0 – TOV2 - Timer/Counter2 Overflow Flag
The TOV2 bit is set (one) when an overflow occurs in Timer/Counter2. TOV2 is cleared
by hardware when executing the corresponding interrupt handling vector. Alternatively,
TOV2 is cleared by writing a logic one to the flag. When the SREG I-bit, TOIE2A
(Timer/Counter2 Overflow Interrupt Enable), and TOV2 are set (one), the
Timer/Counter2 Overflow interrupt is executed. In PWM mode, this bit is set when
Timer/Counter2 changes counting direction at 0x00.