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ATMEGA128-16AU 数据表(PDF) 17 Page - ATMEL Corporation |
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ATMEGA128-16AU 数据表(HTML) 17 Page - ATMEL Corporation |
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17 / 386 page  17 2467R–AVR–06/08 ATmega128 When using the SEI instruction to enable interrupts, the instruction following SEI will be exe- cuted before any pending interrupts, as shown in this example. Interrupt Response Time The interrupt execution response for all the enabled AVR interrupts is four clock cycles mini- mum. After four clock cycles, the program vector address for the actual interrupt handling routine is executed. During this 4-clock cycle period, the Program Counter is pushed onto the Stack. The vector is normally a jump to the interrupt routine, and this jump takes three clock cycles. If an interrupt occurs during execution of a multi-cycle instruction, this instruction is completed before the interrupt is served. If an interrupt occurs when the MCU is in Sleep mode, the inter- rupt execution response time is increased by four clock cycles. This increase comes in addition to the start-up time from the selected sleep mode. A return from an interrupt handling routine takes four clock cycles. During these 4-clock cycles, the Program Counter (two bytes) is popped back from the Stack, the Stack Pointer is incre- mented by two, and the I-bit in SREG is set. Assembly Code Example sei ; set global interrupt enable sleep ; enter sleep, waiting for interrupt ; note: will enter sleep before any pending ; interrupt(s) C Code Example __enable_interrupt(); /* set global interrupt enable */ __sleep(); /* enter sleep, waiting for interrupt */ /* note: will enter sleep before any pending interrupt(s) */ |
类似零件编号 - ATMEGA128-16AU |
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类似说明 - ATMEGA128-16AU |
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