程序报了一个错误，是关于重复定义引用的，但实在找不出是哪里的问题？下面是报错信息：
linking...
*** WARNING L15: MULTIPLE CALL TO SEGMENT
SEGMENT: ?PR?_PRINTCOM?USART
CALLER1: ?PR?EXTINT0HANDLER?MAIN
CALLER2: ?C_C51STARTUP
Program Size: data=29.0 xdata=0 code=1875
creating hex file from "1111"...
"1111" - 0 Error(s), 1 Warning(s).
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