Rainbow-electronics Atmega169L Manual do Utilizador descarregar pdf (Página 140)

140

ATmega169V/L

2514A–AVR–08/02

Timer/Counter2 Interrupt Flag

• 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, OCIE2

(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.

Bit 76543210

– – – – – – OCF2A TOV2 TIFR2

Read/Write R RRRRRR/WR/W

InitialValue00000000

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Rainbow-electronics Atmega169L Manual do Utilizador Página 140