PC sent signal via print control port and STROBE, encoder generated choosing signal and sent it to P3.2-end of single-chip to form interrupt.
PC通过打印机控制口与STROBE发送信号，译码器产生选片信号，传给单片机P 3.2端形成中断信号。
PC sent signal via print control port and STROBE, encoder generated choosing signal and sent it to P3.2-end of single-chip to form interrupt.
PC通过打印机控制口与STROBE发送信号，译码器产生选片信号，传给单片机P 3.2端形成中断信号。
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