ATmega16 datasheet(110/315 Pages) ATMEL

110 / 315 page

110

ATmega16(L)

2466E–AVR–10/02

Timer/Counter Interrupt Flag

Note:

This register contains flag bits for several Timer/Counters, but only Timer1 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

when the counter reaches the TOP value.

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

natively, 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 Out-

put 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 Out-

put 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 WGM13:0 bits setting. In normal and CTC

modes, the TOV1 flag is set when the timer overflows. Refer to Table 47 on page 106

for the TOV1 flag behavior when using another WGM13:0 bit setting.

TOV1 is automatically cleared when the Timer/Counter1 Overflow interrupt vector is

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

Bit

765

432

OCF2

TOV2

ICF1

OCF1A

OCF1B

TOV1

OCF0

TOV0

TIFR

Read/Write

R/W

Initial Value

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