我在keil上编译非常简单的汇编程序，老是出现警告？
我选的at89c51
ORG 0000H
AJMP START
ORG 0030H
START:MOV SP,#59H
MOV P0,#00H
MOV P1,#00H
MOV P2,#00H
MOV P3,#00H
SETB P0.4
SETB P1.3
SETB P2.2
SETB P3.1
MOV R0,#12H
MOV R1,#89H
END
Build target 'Target 1'
assembling Text1.asm...
linking..
*** WARNING L5: CODE SPACE MEMORY OVERLAP
FROM: 0000H
TO: 0002H
*** WARNING L5: CODE SPACE MEMORY OVERLAP
FROM: 0000H
TO: 027DH
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: ?C_START
MODULE: STARTUP.obj (?C_STARTUP)
ADDRESS: 080AH
Program Size: data=9.0 xdata=0 code=728
creating hex file from "test"...
"test" - 0 Error(s), 4 Warning(s). |
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