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介绍了扩展键盘的新方法:交互式和双键交互式,并给出了硬件连接和软件框图.两种方式均显著增加键位容量.在I/O线较少时,这两种方式提供了极大的方便.
Introduced a new way to expand the keyboard: interactive and double-key interactive, and gives the hardware connection and software block diagram, both ways significantly increase the key bit capacity in the I / O lines are small, these two methods provide Great convenience.