题目内容
The interrupt of C51 is handled by special interrupt function.
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In C51 language, a function is an executive code segment to complete certain related functions. It is used to describe the same thing with the other two nouns "subroutine" and "procedure".
In C51 programming language, when writing interrupt service function, it is necessary to consider how to write program segments for field protection, blocking other interrupts, and automatically restoring the field when returning.
A global variable is a variable that exists in a function and is only valid inside the function.
Global variables can be defined by static keywords. Because global variables exist all the time, they occupy a lot of memory units and increase the coupling of programs, which is not conducive to the migration or reuse of programs.
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