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1、裝配說明
2、電路(lu)原(yuan)理圖
3、元件清單
4、常見問題
裝配說明:
1、74HC194具有并行(xing)輸(shu)(shu)(shu)(shu)(shu)入(ru),串行(xing)左(zuo)移(yi)輸(shu)(shu)(shu)(shu)(shu)入(ru),串行(xing)右移(yi)輸(shu)(shu)(shu)(shu)(shu)入(ru)使用(yong)(yong)(yong)時只要(yao)(yao)將(jiang)MR處于高電平,然后選擇控制方式,如果要(yao)(yao)選用(yong)(yong)(yong)并行(xing)輸(shu)(shu)(shu)(shu)(shu)入(ru),將(jiang)S0,S1分別置1,然后給(gei)(gei)(gei)D3~D0數(shu)(shu)據(ju),給(gei)(gei)(gei)CP一(yi)(yi)個(ge)(ge)(ge)上(shang)升沿(yan)(yan),這樣(yang)(yang)數(shu)(shu)據(ju)就(jiu)被(bei)寫(xie)(xie)到(dao)了(le)輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)端Q3~Q0了(le)。CP相當于一(yi)(yi)個(ge)(ge)(ge)鎖(suo)存(cun)信號控制,給(gei)(gei)(gei)一(yi)(yi)個(ge)(ge)(ge)上(shang)升沿(yan)(yan),輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)與(yu)輸(shu)(shu)(shu)(shu)(shu)入(ru)同步,不給(gei)(gei)(gei)上(shang)升沿(yan)(yan),輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)保持(chi)。如果要(yao)(yao)選用(yong)(yong)(yong)串行(xing)左(zuo)移(yi)輸(shu)(shu)(shu)(shu)(shu)入(ru),只要(yao)(yao)將(jiang)S0=0,S1=1,然后給(gei)(gei)(gei)SR數(shu)(shu)據(ju)a,之(zhi)后CP輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)一(yi)(yi)個(ge)(ge)(ge)上(shang)升沿(yan)(yan),就(jiu)寫(xie)(xie)入(ru)一(yi)(yi)個(ge)(ge)(ge)SR到(dao)D0,接著給(gei)(gei)(gei)SR數(shu)(shu)據(ju)b,CP輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)一(yi)(yi)個(ge)(ge)(ge)上(shang)升沿(yan)(yan),這樣(yang)(yang)數(shu)(shu)據(ju)b又寫(xie)(xie)入(ru)了(le)D0,D0的值給(gei)(gei)(gei)了(le)D1,這樣(yang)(yang)依(yi)次移(yi)位。達到(dao)串行(xing)輸(shu)(shu)(shu)(shu)(shu)入(ru)的目的。如果輸(shu)(shu)(shu)(shu)(shu)出(chu)(chu)數(shu)(shu)據(ju)要(yao)(yao)取消的話(hua)可(ke)以用(yong)(yong)(yong)MR置0的方式。
2、拿(na)到套(tao)件(jian)以后,請對照元器(qi)件(jian)清單仔(zi)細核對,并用(yong)萬用(yong)表粗略測量各元器(qi)件(jian)的參數,檢查元器(qi)件(jian)是否有(you)誤。然后對照裝(zhuang)配(pei)圖焊接元器(qi)件(jian),檢查有(you)無虛焊、
錯焊、漏焊,檢查無誤(wu)后上電調試。