题目内容
Only when an interrupt request is sent by an interrupt source and the CPU interrupts, can the CPU respond to the interrupt.
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The same level interrupt in AT89S51 can't be nested.
External interrupt 0 can interrupt the interrupt service program of external interrupt 1.
Interrupt service subroutine can be called directly.
On the premise of interrupting, as long as the interrupt source sends an interrupt request, the CPU will respond to the interrupt immediately.
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