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拨号与显示电路这部分电路见图5。图中V_9、可控硅(CR02)、SND F键和END键等组成电源控制器。手机通电后,V_9处导通状态。当按SND F键后,可控硅受触发而导通,建立了V_R电压,使手机开机。若按END键,则V_9截止,可控硅因阳极失去电压而截止,故手机关机。键盘中的拨号键0～9、*、#及重拨键以矩阵形式连接于LSI的键盘接口,其中COL为纵线,ROW为横线。LSI的时钟频率为
Dial and display circuit This part of the circuit shown in Figure 5. The figure V_9, SCR (CR02), SND F key and END keys and other components of the power controller. After the phone is powered on, V_9 turn on state. When press the SND F key, the SCR is triggered and turned on, the establishment of the V_R voltage, the phone boot. If you press the END key, then V_9 deadline, thyristor due to the loss of voltage and the anode deadline, so the phone off. The dialing keys 0 ~ 9, *, # and redial keys in the keyboard are connected to the keyboard interface of the LSI in a matrix, where COL is the vertical line and ROW is the horizontal line. LSI clock frequency is