Data Types

The C251 Compiler provides several basic data types you may use in your C programs. The compiler supports the standard C data types as well as several data types that are unique to the C251 platform.

Data Types	Bits	Bytes	Value Range
bit	1		0 to 1
signed char	8	1	-128 — +127
unsigned char	8	1	0 — 255
enum	16	2	-32768 — +32767
signed short int	16	2	-32768 — +32767
unsigned short int	16	2	0 — 65535
signed int	16	2	-32768 — +32767
unsigned int	16	2	0 — 65535
signed long int	32	4	-2147483648 — +2147483647
unsigned long int	32	4	0 — 4294967295
float	32	4	±1.175494E-38 — ±3.402823E+38
double	64	8	±1.175494E-38 — ±3.402823E+38
idata, data, pdata*	8	1	0 to 0xFF
near, xdata, code*	16	2	0 to 0xFFFF
far, huge	32	4	0 to 0xFFFFFF
sbit	1		0 or 1
sfr	8	1	0 — 255
sfr16	16	2	0 — 65535

Note

The bit, sbit, sfr, and sfr16 data types are not provided in ANSI C. They are unique to the C251 Compiler.