volatile unsigned char xdata *p = &xdata_junk; unsigned char t1, t2; t1 = *p; t2 = *p; } 编译的汇编为: 0000 7E00 R MOV R6,#HIGH xdata_junk 0002 7F00 R MOV R7,#LOW xdata_junk ;--- Variable 'p' assigned to Register 'R6/R7' --- 0004 8F82 MOV DPL,R7 0006 8E83 MOV DP...