AT90USB646 datasheet(148/459 Pages) ATMEL

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7593H–AVR–11/08

ATmega32U6/AT90USB64/128

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

(ICRn) is set by the WGMn3:0 to be used as the TOP value, the ICFn Flag is set when the coun-

ter reaches the TOP value.

ICFn is automatically cleared when the Input Capture Interrupt Vector is executed. Alternatively,

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

• Bit 3– OCFnC: Timer/Countern, Output Compare C Match Flag

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

Compare Register C (OCRnC).

Note that a Forced Output Compare (FOCnC) strobe will not set the OCFnC Flag.

OCFnC is automatically cleared when the Output Compare Match C Interrupt Vector is exe-

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

• Bit 2 – OCFnB: Timer/Counter1, Output Compare B Match Flag

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

Compare Register B (OCRnB).

Note that a Forced Output Compare (FOCnB) strobe will not set the OCFnB Flag.

OCFnB is automatically cleared when the Output Compare Match B Interrupt Vector is exe-

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

• Bit 1 – OCF1A: Timer/Counter1, Output Compare A Match Flag

This flag is set in the timer clock cycle after the counter (TCNTn value matches the Output Com-

pare Register A (OCRnA).

Note that a Forced Output Compare (FOCnA) strobe will not set the OCFnA Flag.

OCFnA is automatically cleared when the Output Compare Match A Interrupt Vector is exe-

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

• Bit 0 – TOVn: Timer/Countern, Overflow Flag

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

the TOVn Flag is set when the timer overflows. Refer to Table 14-4 on page 142 for the TOVn

Flag behavior when using another WGMn3:0 bit setting.

TOVn is automatically cleared when the Timer/Countern Overflow Interrupt Vector is executed.

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

AT90USB646 Datasheet(PDF) 148 Page - ATMEL Corporation