Rainbow-electronics ATmega8HVD Bedienungsanleitung PDF herunterladen (Seite 89)

8052B–AVR–09/08

ATmega4HVD/8HVD

• Bit 2 – OCFnB: Output Compare Flag n B

The OCFnB bit is set when a Compare Match occurs between the Timer/Counter and the data

in OCRnB – Output Compare Register n B. OCFnB is cleared by hardware when executing

the corresponding interrupt handling vector. Alternatively, OCFnB is cleared by writing a logic

one to the flag. When the I-bit in SREG, OCIEnB (Timer/Counter Compare B Match Interrupt

Enable), and OCFnB are set, the Timer/Counter Compare Match Interrupt is executed.

The OCFnB is not set in 16-bit Output Compare mode when the Output Compare Register

OCRnB is used as the high byte of the 16-bit Output Compare Register or in 16-bit Input Cap-

ture mode when the Output Compare Register OCRnB is used as the high byte of the Input

Capture Register.

• Bit 1– OCFnA: Output Compare Flag n A

The OCFnA bit is set when a Compare Match occurs between the Timer/Counter n and the

data in OCRnA – Output Compare Register n. OCFnA is cleared by hardware when executing

the corresponding interrupt handling vector. Alternatively, OCFnA is cleared by writing a logic

one to the flag. When the I-bit in SREG, OCIEnA (Timer/Counter n Compare Match Interrupt

Enable), and OCFnA are set, the Timer/Counter n Compare Match Interrupt is executed.

The OCFnA is also set in 16-bit mode when a Compare Match occurs between the

Timer/Counter n and 16-bit data in OCRnB/A. The OCFnA is not set in Input Capture mode

when the Output Compare Register OCRnA is used as an Input Capture Register.

• Bit 0 – TOVn: Timer/Counter n Overflow Flag

The bit TOVn is set when an overflow occurs in Timer/Counter n. TOVn is cleared by hard-

ware when executing the corresponding interrupt handling vector. Alternatively, TOVn is

cleared by writing a logic one to the flag. When the SREG I-bit, TOIEn (Timer/Counter n Over-

flow Interrupt Enable), and TOVn are set, the Timer/Counter n Overflow interrupt is executed.

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Rainbow-electronics ATmega8HVD Bedienungsanleitung Seite 89