请教如何看keil中的汇编代码？如
134: main_adr = 0;
135:
136: ？？？为什么此处是空白？
140: LED=1;
C:0x0063 D292 SETB LED(0x90.2) ？？？
sbit P1_0 = 0x90;
sbit P1_1 = 0x91;
sbit P1_2 = 0x92;
sbit P1_3 = 0x93;
sbit P1_4 = 0x94;
sbit P1_5 = 0x95;
sbit P1_6 = 0x96;
sbit P1_7 = 0x97;
sbit T2 = 0x90; /* External input to Timer/Counter 2, clock out */
sbit T2EX = 0x91; /* Timer/Counter 2 capture/reload trigger & dir ctl */
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