WebJul 2, 2012 · wr和rd作为p3的两位具有第二功能的i/o口只有在连接特定器件(例如扩展ram或rom等)时才能发挥第二作用(wr为写,rd为读),一般情况下可以直接当做是gpio(通 … WebCN107505867A CN202410660579.8A CN202410660579A CN107505867A CN 107505867 A CN107505867 A CN 107505867A CN 202410660579 A CN202410660579 A CN 202410660579A CN 107505867 A CN107505867 A CN 107505867A Authority CN China Prior art keywords chip control module optical pins dimensional measurement Prior art …
CN201303348Y - 通用多串行总线转换装置 - Google Patents
Web8080总线又叫Intel总线,大致来说,Intel总线的控制线有四根,RD写使能,WR读使能,ALE地址锁存,CS片选。 8080中:有RD(read),WR(Write)脚,RD,WR可以同时为高,不能同时为低!!RD为低时表示要从LCD中读出数据在D0-D7脚上,WR为低时表示:将当前D0-D7上的数据 … WebJan 11, 2014 · 关注. RD:读外部数据信号. WR:写外部存储器信号. PSEN:外部程序存储器选通信号. EA:内外程序选择信号. ALE:地址锁存信号. 功能:将片内RAM20H开始的50个单元内 … broadgrain seaforth
rd Microsoft Learn
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