介绍了MSP430单片机、CH452数码管显示驱动和键盘扫描控制芯片，设计了一种键盘方案。
This paper introduces the MSP430 SCM, vision driving of the CH452 numerical code tube and the control chip of keyboard scanning, and designs a kind of keyboard plan.
楼层信息由一个74ls48译码芯片驱动的共阴极的数码管显示。
The floor information is displayed by the figures tube of the total cathode that is drived by a 74ls48 code chip.
楼层信息由一个74ls48译码芯片驱动的共阴极的数码管显示。
The floor information is displayed by the figures tube of the total cathode that is drived by a 74ls48 code chip.
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