动态扫描数码显示程序 P0口接J3，数据端口 P2.2接 J2 B端子，表示段码锁存 P2.3接 J2 A端子，标志位码锁存- Dynamic scan digital display program P0 port access J3, data port P2.2 connected J2 B terminals, which means that the code segment latch P2.3 connected J2 A terminal flag c