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ATMEGA128 Datasheet(PDF) 91 Page - ATMEL Corporation |
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ATMEGA128 Datasheet(HTML) 91 Page - ATMEL Corporation |
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91 / 386 page  91 2467R–AVR–06/08 ATmega128 Note: 1. n = 3, 2, 1or 0. When changing the ISCn1/ISCn0 bits, the interrupt must be disabled by clearing its Interrupt Enable bit in the EIMSK Register. Otherwise an interrupt can occur when the bits are changed. External Interrupt Control Register B – EICRB • Bits 7..0 – ISC71, ISC70 - ISC41, ISC40: External Interrupt 7 - 4 Sense Control Bits The External Interrupts 7 - 4 are activated by the external pins INT7:4 if the SREG I-flag and the corresponding interrupt mask in the EIMSK is set. The level and edges on the external pins that activate the interrupts are defined in Table 50. The value on the INT7:4 pins are sampled before detecting edges. If edge or toggle interrupt is selected, pulses that last longer than one clock period will generate an interrupt. Shorter pulses are not guaranteed to generate an interrupt. Observe that CPU clock frequency can be lower than the XTAL frequency if the XTAL divider is enabled. If low level interrupt is selected, the low level must be held until the completion of the currently executing instruction to generate an interrupt. If enabled, a level triggered interrupt will generate an interrupt request as long as the pin is held low. Note: 1. n = 7, 6, 5 or 4. When changing the ISCn1/ISCn0 bits, the interrupt must be disabled by clearing its Interrupt Enable bit in the EIMSK Register. Otherwise an interrupt can occur when the bits are changed. Table 48. Interrupt Sense Control(1) ISCn1 ISCn0 Description 0 0 The low level of INTn generates an interrupt request. 01 Reserved 1 0 The falling edge of INTn generates asynchronously an interrupt request. 1 1 The rising edge of INTn generates asynchronously an interrupt request. Table 49. Asynchronous External Interrupt Characteristics Symbol Parameter Condition Min Typ Max Units tINT Minimum pulse width for asynchronous external interrupt 50 ns Bit 765 4321 0 ISC71 ISC70 ISC61 ISC60 ISC51 ISC50 ISC41 ISC40 EICRB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 000 0000 0 Table 50. Interrupt Sense Control (1) ISCn1 ISCn0 Description 0 0 The low level of INTn generates an interrupt request. 0 1 Any logical change on INTn generates an interrupt request 10 The falling edge between two samples of INTn generates an interrupt request. 11 The rising edge between two samples of INTn generates an interrupt request. |
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