ATTINY9_14 Datasheet, PDF (78/170 Pages) ATMEL Corporation – Atmel 8-bit AVR Microcontroller

11.11.9 TIFR0 – Timer/Counter Interrupt Flag Register 0
Bit
7
6
5
4
3
0x2A
–
–
ICF0
–
–
Read/Write
R
R
R/W
R
R
Initial Value
0
0
0
0
0
2
OCF0B
R/W
0
1
OCF0A
R/W
0
0
TOV0
R/W
0
TIFR0
• Bits 7:6, 4:3 – Reserved Bits
These bits are reserved for future use. For ensuring compatibility with future devices, these bits must be written to
zero when the register is written.
• Bit 5 – ICF0: Timer/Counter0, Input Capture Flag
This flag is set when a capture event occurs on the ICP0 pin. When the Input Capture Register (ICR0) is set by the
WGM03:0 to be used as the TOP value, the ICF0 flag is set when the counter reaches the TOP value.
ICF0 is automatically cleared when the Input Capture Interrupt Vector is executed. Alternatively, ICF0 can be
cleared by writing a logic one to its bit location.
• Bit 2 – OCF1B: Timer/Counter0, Output Compare B Match Flag
This flag is set in the timer clock cycle after the counter (TCNT0) value matches the Output Compare Register B
(OCR0B).
Note that a Forced Output Compare (0B) strobe will not set the OCF0B 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 1 – OCF0A: Timer/Counter0, Output Compare A Match Flag
This flag is set in the timer clock cycle after the counter (TCNT0) value matches the Output Compare Register A
(OCR0A).
Note that a Forced Output Compare (1A) strobe will not set the OCF0A flag.
OCF0A is automatically cleared when the Output Compare Match A Interrupt Vector is executed. Alternatively,
OCF0A can be cleared by writing a logic one to its bit location.
• Bit 0 – TOV0: Timer/Counter0, Overflow Flag
The setting of this flag is dependent of the WGM03:0 bits setting. In Normal and CTC modes, the TOV0 flag is set
when the timer overflows. See Table 11-5 on page 74 for the TOV0 flag behavior when using another WGM03:0 bit
setting.
TOV0 is automatically cleared when the Timer/Counter0 Overflow Interrupt Vector is executed. Alternatively, TOV0
can be cleared by writing a logic one to its bit location.
11.11.10 GTCCR – General Timer/Counter Control Register
Bit
7
6
5
4
3
2
1
0
0x2F
TSM
–
–
–
–
–
–
PSR
GTCCR
Read/Write
R/W
R
R
R
R
R
R
R/W
Initial Value
0
0
0
0
0
0
0
0
• Bit 7 – TSM: Timer/Counter Synchronization Mode
Writing the TSM bit to one activates the Timer/Counter Synchronization mode. In this mode, the value that is writ-
ten to the PSR bit is kept, hence keeping the Prescaler Reset signal asserted. This ensures that the Timer/Counter
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