看看开机LED灯亮了没有:)<br />没亮就把EA拉上吧!<br /><br />EA貌似是可以锁定的,STC的开机就是高电平的!<br />AT89S51里面有这么一句:“Note, however,that if lock bit 1 is programmed, EA will be internally latched on reset.”<br /><br />怎么这两个检测脚不用中断来做呢?
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