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摘要：Absolute Variable LocationVariables may be located at absolute memory locations in your C programsource modules using the _at_ keyword. The usage for this feature is:type _memory_space_ variable_name _at_ constant;where:memory_space is the memory space for the variable. If missing from thedeclaratio 阅读全文

摘要：XBYTEThe XBYTE macro allows you to access individual bytes in the external datamemory of the 8051. You may use this macro in your programs as follows:rval = XBYTE [0x0002];XBYTE [0x0002] = 57;to read or write the contents of the byte in external data memory at address0002h. 阅读全文