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<!--Interrupt Unit External Interrupt - INT0 ; ;go to IRQ0 Handler ;Main program start ;.............................. ;IRQ0 Handler ;return to main program ....... rjmp in reti ......... $0001 $0020 $0031 $0032 .......... .................. EXT_INT0 main r16, PORTB Labels Comments Code Address main: EXT_INT0: External Interrupt - INT0 The External Interrupt INT0 is triggered by the INT0 pin. If the interrupt enabled ( the I-bit in SREG and the INT0-bit in GIMSK, are set (one)) , the MCU will jump to program memory address $0001, even if the INT0 pin is configured as outputs. The External Interrupt INT0 can be triggered by a falling or rising edge or a low level. This is set up as indicated in the specification for the MCU Control Register (MCUCR). When the External Interrupt is enabled and is configured as level-triggered, the interrupt will trigger as long as the pin is held low. MCUCR GIMSK GIFR I ISC01 INTF0 ISC00 The low level of INT0 generates an interrupt I/O-Register I/O-Register Bit \ The falling edge of INT0 generates an interrupt / The rising edge of INT0 generates an interrupt INT0 (Pin) M C U --><OBJECT classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
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