题目内容
After the MCS-51 system is reset, the interrupt request flag TCON and scon are all 0.
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The function of IE in interrupt permission register of MCS-51 single chip microcomputer is to open or shield the interrupt sources.答案:
When writing interrupt service program, the user can store an unconditional transfer instruction in the interrupt entry vector address to prevent the interrupt service program from being unable to accommodate.
If you want to disable higher priority interrupts when executing the current interrupt program, the application software will turn off CPU interrupts, or shield interrupts from higher level interrupt sources, and then turn on interrupts when interrupts return.
After the CPU responds to the interrupt, it must clear the corresponding interrupt flag bit with software in the interrupt service program to cancel the interrupt request.
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