题目内容
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.
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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.
The serial port data buffer SBUF is a special register which can be directly addressed.
To allow external interrupt 0 interrupt, set EA bit and ex0 bit of interrupt allow register ie to 1.答案:
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