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ATtiny44 Datasheet(PDF) 50 Page - ATMEL Corporation |
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ATtiny44 Datasheet(HTML) 50 Page - ATMEL Corporation |
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50 / 236 page  50 8006H–AVR–10/09 ATtiny24/44/84 Note that if a level triggered interrupt is used for wake-up from Power-down, the required level must be held long enough for the MCU to complete the wake-up to trigger the level interrupt. If the level disappears before the end of the Start-up Time, the MCU will still wake up, but no inter- rupt will be generated. The start-up time is defined by the SUT and CKSEL fuses, as described in “Clock System” on page 24. If the low level on the interrupt pin is removed before the device has woken up then program execution will not be diverted to the interrupt service routine but continue from the instruction fol- lowing the SLEEP command. 9.2.2 Pin Change Interrupt Timing An example of timing of a pin change interrupt is shown in Figure 9-1. Figure 9-1. Timing of pin change interrupts clk PCINT(0) pin_lat pin_sync pcint_in_(0) pcint_syn pcint_setflag PCIF PCINT(0) pin_sync pcint_syn pin_lat D Q LE pcint_setflag PCIF clk clk PCINT(0) in PCMSK(x) pcint_in_(0) 0 x |
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