表1 Keil uVision4面向51單片機的基本數據類型各種屬性一覽表

qTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTrU類  別U  數  據  類  型  U長 度U           值  域            UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned char     U1字節U0～255                       UU字符型Usigned char       U1字節U-128～+127                   UU      Uchar              U1字節U-128～+127                   UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned short intU2字節U0～65535                     UU      Usigned short int  U2字節U-32768～+32767               UU      Ushort int         U2字節U-32768～+32767               UU      UTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned short    U2字節U0～65535                     UU整  型Usigned short      U2字節U-32768～+32767               UU      Ushort             U2字節U-32768～+32767               UU      UTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned int      U2字節U0～65535                     UU      Usigned int        U2字節U-32768～+32767               UU      Uint               U2字節U-32768～+32767               UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned long int U4字節U0～4294967295                UU      Usigned long int   U4字節U-2147483648～+2147483647     UU      Ulong int          U4字節U-2147483648～+2147483647     UU長整型UTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Uunsigned long     U4字節U0～4294967295                UU      Usigned long       U4字節U-2147483648～+2147483647     UU      Ulong              U4字節U-2147483648～+2147483647     UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Ufloat             U4字節U±1.75494E-38～±3.402823E+38UU浮點型Udouble            U4字節U±1.75494E-38～±3.402823E+38UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Ubit               U1位  U0，1                         UU位  型Usbit              U1位  U0，1                         UUTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTUU      Usbit              U1位  U0，1                         UUSFR 型Usfr               U1字節U0～255                       UU      Usfr16             U2字節U0～65535                     UtTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTs