ATA8743-PXQW【PDF 135/238 页】MCU W/TRANSMITTER ASK/FSK 24QFN

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135

9152BINDCO02/10

ATA8743

21.11.9 TIFR1 Timer/Counter Interrupt Flag Register 1

" Bit 7,6,4,3 Reserved Bit

This bit is reserved for future use. For ensuring compatibility with future devices, this bit must be

written to zero when the register is written.

" 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 WGM13:0 to be used as the TOP value, the ICF1 flag is set when the coun-

ter 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 2 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 (1B) strobe will not set the OCF1B flag.

OCF1B is automatically cleared when the Output Compare Match B Interrupt Vector is exe-

cuted. Alternatively, OCF1B 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 (TCNT1) value matches the Output

Compare Register A (OCR1A).

Note that a Forced Output Compare (1A) strobe will not set the OCF1A flag.

OCF1A is automatically cleared when the Output Compare Match A Interrupt Vector is exe-

cuted. 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 WGM13:0 bits setting. In Normal and CTC modes,

the TOV1 flag is set when the timer overflows. See Table 21-4 on page 131 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

0x0B (0x2B)

ICIF1

OCF1B

OCF1A

TOV1

TIFR1

Read/Write

R/W

Initial Value

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