In the paper,the memory distribution of MCS-51 microcontroller,the storage mode of C51 variable and the transfer mode of function parameter are introduced,which causes the thinking and analysis of the reentrant problem of C51 function.Unlike other processor C compilers,in addition to the fact that explicit access to global resources in the body of a function breaks function reentrant,C51 function parameter passing and local variable store allocation may also result in implicit global resource access conflicts that cause function non-reentrant.Based on the analysis of global resource access conflicts in various cases,the corresponding solutions are put forward to avoid software running exceptions caused by non-reentrant function being called by multi-task.
Key words
MCS-51 /
memory distribution /
storage mode /
parameter passing /
access conflict
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References
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