A为“1 1〞时,按START微动开关,即可转入到第01号“取指〞微指令,启动程序运行。Р上述三条控制台指令用两个开关SWB、SWA的状态来设置,得SWB、SWA定义表,如表2-2所示。Р 表2-2 SWB、SWA定义表РSWBРSWAР控制台指令Р0Р0Р读内存〔KRD〕Р0Р1Р写内存〔KWE〕Р1Р1Р启动程序〔RP〕Р2.4.2数据通路图 Р 实验系统的数据通路图,如图2.1所示。РРРРРРРРРРРРРРРРРР图2.1 数据流程图Р注意:Р① 片选信号CE=0为有效电平,CE=1为无效电平。Р② WE=1为写入,WE=0为读出。Р③ LOAD和LDPC同时为“1〞时,可将总线上的数据装入到PC中,LDPC为“1〞,同时LOAD为“0〞时,将PC中的内容加1。РРof rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilitiesРРof rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities