signed char and unsigned char
... PD @ (unsigned)&RCON*8+2;3.4.4 8位整形数据类型和变量PICC18同时支持有符号和无符号字符型（signed char and unsigned char），假如关键字signed 和unsigned 没有标明，则char默认状态下为unsigned char。
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signed char and unsigned char
有符号char和无符号char
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The unsigned char data type, and byte data type will yield incorrect results and act as though they are signed types i. e. type char.
无符号字符数据类型和二进制数据类型将产生错误的计算结果，会当成有符号的数据类型进行计算。
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