Abstract：
This text has explained the display and keyboard in the frequency synthesizer of phase locking are designed, have analyses the application, design and design of many kinds of keyboards of many kinds of displays. What rational making use of knowledge that we study to design the display and keyboard to use in the application of the one-chip computer is analyses synthetically. Utilize 74LS48 integrated circuit become BCD yards of decipher seven show and export finally. And then use a ULN2003 as the location to drive , purchase into a dynamic display , has adopted the encoder of having priority in the keyboard design, having prevented the competition from producing, and the code outputs the code forming the keyboard directly, have simplified the design program of the one-chip computer
关键词
七段数码显示，优先编码，动态扫描
Key words
Seven sections of numbers showing, priority encode, Dynamic scanning
