单片机入门的书，很适合 初学者，U1=89C51
U2=555
U3=MAX232
U4=24C01
U6＝X25045看门狗
X1=共阳数码管 -Singlechip book entry, it is suitable for beginners, U1 = 89C51U2 = 555U3 = MAX232U4 = 24C01U6 = X25045 watchdog X1 = total yang digital tube
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