编译时有警告如下：
Build target '目标 1'
linking...
*** WARNING L5: CODE SPACE MEMORY OVERLAP
FROM: 000BH
TO: 000DH
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: DELAY1
MODULE: 1602.obj (1602)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: DELAY1
MODULE: 1602.obj (1602)
ADDRESS: 0018H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: DELAY1
MODULE: 1602.obj (1602)
ADDRESS: 001DH
Program Size: data=78.1 xdata=0 code=781
creating hex file from "1602"...
"1602" - 0 Error(s), 4 Warning(s).
请高手看一下，帮改一下，本人新手刚学单片机。
