unsigned char 1字节 0~255
signed char 1字节 -128~+127
char 1字节 -128~+127
unsigned short int 2字节 0~65535
signed short int 2字节 -32768~+32767
short int 2字节 -32768~+32767
unsigned short 2字节 0~65535
signed short 2字节 -32768~+32767
short 2字节 -32768~+32767
unsigned int 2字节 0~65535
signed int 2字节 -32768~+32767
int 2字节 -32768~+32767
unsigned long int 4字节 0~4294967295
signed long int 4字节 -2147483648~+2147483647 ║
long int 4字节 -2147483648~+2147483647
unsigned long 4字节 0~4294967295
signed long 4字 -2147483648~+2147483647
long 4字 -2147483648~+2147483647
float 4字节 ±1.75494E-38~±3.402823E+38
double 4字节 ±1.75494E-38~±3.402823E+38
bit 1位 0,1
sbit 1位 0,1
sfr 1字节 0-255
sfr16 2字节0~65535
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