ATmega128 datasheet(141/386 Pages) ATMEL

141 / 386 page

141

2467S–AVR–07/09

ATmega128

• Bit 2 – TOIE3: Timer/Counter3, Overflow Interrupt Enable

When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally

enabled), the Timer/Counter3 Overflow Interrupt is enabled. The corresponding interrupt vector

(see “Interrupts” on page 60) is executed when the TOV3 flag, located in ETIFR, is set.

• Bit 1 – OCIE3C: Timer/Counter3, Output Compare C Match Interrupt Enable

When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally

enabled), the Timer/Counter3 Output Compare C Match Interrupt is enabled. The corresponding

interrupt vector (see “Interrupts” on page 60) is executed when the OCF3C flag, located in

ETIFR, is set.

• Bit 0 – OCIE1C: Timer/Counter1, Output Compare C Match Interrupt Enable

When this bit is written to one, and the I-flag in the Status Register is set (interrupts globally

enabled), the Timer/Counter1 Output Compare C Match Interrupt is enabled. The corresponding

interrupt vector (see “Interrupts” on page 60) is executed when the OCF1C flag, located in

ETIFR, is set.

Timer/Counter

Interrupt Flag Register

– TIFR

Note:

This register contains flag bits for several Timer/Counters, but only timer 1 bits are described in

this section. The remaining bits are described in their respective timer sections.

• Bit 5 – ICF1: Timer/Counter1, Input Capture Flag

This flag is set when a capture event occurs on the ICP1 pin. When the Input Capture Register

(ICR1) is set by the WGMn3:0 to be used as the TOP value, the ICF1 flag is set when the coun-

ter reaches the TOP value.

ICF1 is automatically cleared when the Input Capture Interrupt vector is executed. Alternatively,

ICF1 can be cleared by writing a logic one to its bit location.

• Bit 4 – OCF1A: Timer/Counter1, Output Compare A Match Flag

This flag is set in the timer clock cycle after the counter (TCNT1) value matches the Output

Compare Register A (OCR1A).

Note that a forced output compare (FOC1A) strobe will not set the OCF1A flag.

OCF1A is automatically cleared when the Output Compare Match A interrupt vector is executed.

Alternatively, OCF1A can be cleared by writing a logic one to its bit location.

• Bit 3 – OCF1B: Timer/Counter1, Output Compare B Match Flag

This flag is set in the timer clock cycle after the counter (TCNT1) value matches the Output

Compare Register B (OCR1B).

Note that a forced output compare (FOC1B) strobe will not set the OCF1B flag.

OCF1B is automatically cleared when the Output Compare Match B interrupt vector is executed.

Alternatively, OCF1B can be cleared by writing a logic one to its bit location.

• Bit 2 – TOV1: Timer/Counter1, Overflow Flag

The setting of this flag is dependent of the WGMn3:0 bits setting. In normal and CTC modes, the

TOV1 flag is set when the timer overflows. Refer to Table 61 on page 135 for the TOV1 flag

behavior when using another WGMn3:0 bit setting.

Bit

765

4321

OCF2

TOV2

ICF1

OCF1A

OCF1B

TOV1

OCF0

TOV0

TIFR

Read/Write

R/W

Initial Value

000

0000

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