Datasheet

ATmega164A/PA/324A/PA/644A/PA/1284/P
 2018 Microchip Technology Inc. Data Sheet Complete DS40002070A-page 144
• Bit 1 – 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 0 – 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 16-5 on page 138 for the TOV1 Flag behavior when using another
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.
16.12.15TIFR3 – Timer/Counter3 Interrupt Flag Register
• Bit 7:6 – Reserved
These bits are unused and will always read as zero.
• 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 (ICR1) is set by
the WGMn3:0 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 Interrupt Vector is executed. Alternatively, ICF3 can be
cleared by writing a logic one to its bit location.
• Bit 4:3 – Reserved
These bits are unused and will always read as zero.
• Bit 2 – OCF3B: Timer/Counter3, Output Compare B Match Flag
This flag is set in the timer clock cycle after the counter (TCNT3) value matches the Output Compare Register B
(OCR3B).
Note that a Forced Output Compare (FOC3B) strobe will not set the OCF3B Flag.
OCF3B is automatically cleared when the Output Compare Match B Interrupt Vector is executed. Alternatively,
OCF3B can be cleared by writing a logic one to its bit location.
• Bit 1 – 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.
OCF3A is automatically cleared when the Output Compare Match A Interrupt Vector is executed. Alternatively,
OCF3A can be cleared by writing a logic one to its bit location.
Bit 76543210
0x18 (0x38)
– –ICF3– – OCF3B OCF3A TOV3 TIFR3
Read/Write R R R/W R R R/W R/W R/W
Initial Value00000000