ATMEGA169PV-8MCU【PDF 8/274 页】MCU AVR 16K ISP FLASH 8MHZ 64QFN

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105

8018P–AVR–08/10

ATmega169P

Bit 1 – 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 (one), the

Timer/Counter0 Compare Match A interrupt is enabled. The corresponding interrupt is executed

if a compare match in Timer/Counter0 occurs, that is, when the OCF0A bit is set in the

Timer/Counter 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, that is, when the TOV0 bit is set in the Timer/Counter 0 Inter-

rupt Flag Register – TIFR0.

14.9.5

TIFR0 – Timer/Counter 0 Interrupt Flag Register

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

765

432

0x15 (0x35)

–

–OCF0A

TOV0

TIFR0

Read/Write

RRR

R/W

Initial Value

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