单片机的码制与PC机不同，这里运用了一个小程序实现了两者之间的兼容-MCU code system and PC are different, here the use of a small program to achieve compatibility between the two

FPGA 代码与ASIC代码之间的转换，对理解二者编程很有好处。-Conversion Design and FPGA code between ASCII code design, programming understanding of both great help.

给定一个大写字母，要求用小写字母输出。同一个字母，用小写字符表示的ASCII代码比用大写字母表示的字符的ASCII代码大32.-Given an uppercase letter, it is required to output in lowercase letters. The same letter, the ASCII code in lower case characters, is larger than the ASCII code of characters in upperca