51 Singlechip frequently used subroutine is 16 hexadecimal and hexadecimal conversion between 10 and 4* 4 keyboard subroutine.

Packet : 43680507for51.rar filelist
新建文件夹\单行键盘.txt
新建文件夹\多字节BIN转BCD码.txt
新建文件夹

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