From the data storage type, the 8051 series chip and off-chip program memory on-chip and off-chip data memory, on-chip program memory sub-direct addressing area and indirect addressing types, respectively, corresponding to the code, data, xdata types of idata pdata set according to the characteristics of the 51 series of, use different memory, different program execution efficiency will, in the preparation of the C51 program, it is best to specify variable storage type, so there will be help to improve the efficiency of the program (this issue will be devoted to later). Slightly different from the ANSI-C, only points SAMLL COMPACT, LARGE mode, various modes corresponding to the actual hardware system will also be different from the compiled results

关于keil中data_idata_xdata_pdata_code的问题.docx

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