134
ATmega64A [DATASHEET]
8160D–AVR–02/2013
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 counter 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
WGMn3:0 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.
16.11.20 ETIFR – Extended Timer/Counter Interrupt Flag Register
Bit 7:6 – Reserved Bits
These bits are reserved for future use. For ensuring compatibility with future devices, these bits must be set to zero
when ETIFR is written.
Bit 5 – ICF3: Timer/Counter3, Input Capture Flag
This flag is set when a capture event occurs on the ICP3 pin. When the Input Capture Register (ICR3) is set by the
WGM3:0 to be used as the TOP value, the ICF3 flag is set when the counter reaches the TOP value.
ICF3 is automatically cleared when the Input Capture 3 Interrupt Vector is executed. Alternatively, ICF3 can be
cleared by writing a logic one to its bit location.
Bit 4 – OCF3A: Timer/Counter3, Output Compare A Match Flag
This flag is set in the timer clock cycle after the counter (TCNT3) value matches the Output Compare Register A
(OCR3A).
Note that a Forced Output Compare (FOC3A) strobe will not set the OCF3A flag.
Bit
765
4321
0
–
ICF3
OCF3A
OCF3B
TOV3
OCF3C
OCF1C
ETIFR
Read/Write
R/W
Initial Value
000
0000
0