ATtiny167-ESSZ datasheet(139/282 Pages) ATMEL

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139

7728D–AVR–07/09

ATtiny87/ATtiny167

12.11.10 Timer/Counter1 Interrupt Flag Register – TIFR1

• Bit 7..6 – Reserved Bits

These bits are reserved for future use.

• Bit 5 – ICF1: 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 WGM13:0 to be used as the TOP value, the ICF1 flag is set when the

counter reaches the TOP value.

ICF1 is automatically cleared when the Input Capture Interrupt Vector is executed. Alterna-

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

• Bit 4..3 – Reserved Bits

These bits are reserved for future use.

• Bit 2 – OCF1B: 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 exe-

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

• Bit 1 – OCF1A: 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 exe-

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

• Bit 0 – TOV1: Timer/Counter Overflow Flag

The setting of this flag is dependent of the WGM13:0 bits setting. In Normal and CTC modes,

the TOV1 flag is set when the timer overflows. Refer to Table 12-4 on page 134 for the TOV1

flag behavior when using another WGM13:0 bit setting.

TOV1 is automatically cleared when the Timer/Counter1 Overflow Interrupt Vector is exe-

cuted. Alternatively, TOV1 can be cleared by writing a logic one to its bit location.

Bit

7654

3210

–

ICF1

–

OCF1B

OCF1A

TOV1

TIFR1

Read/Write

R/W

Initial Value

0000

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