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请教,急求 TMS570LS1227 ERROR引脚在上电时有两次低电平脉冲

   请教个问题,如果CPU没有下载过程序,启动时,ERROR引脚由低升到高电平,现象正常。当下载一个空程序,时钟为系统默认配置,主程序为

main()

{

while(1);

}

测试出ERROR电平由低上升到高电平的过程中,会出现连续两次的低电平现象,间隔约5ms,低电平持续时间约1ms。