ATmega1284P datasheet(139/380 Pages) ATMEL

139 / 380 page

139

8059D–AVR–11/09

ATmega1284P

• 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 exe-

cuted. 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 exe-

cuted. Alternatively, OCF3A can be cleared by writing a logic one to its bit location.

• Bit 0 – TOV3: Timer/Counter1, Overflow Flag

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

the TOV3 Flag is set when the timer overflows. Refer to Table 14-5 on page 133 for the TOV3

Flag behavior when using another WGMn3:0 bit setting.

TOV3 is automatically cleared when the Timer/Counter3 Overflow Interrupt Vector is executed.

Alternatively, TOV3 can be cleared by writing a logic one to its bit location.

ATmega1284P Datasheet(PDF) 139 Page - ATMEL Corporation