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Appendix
Data Types
The C166 Compiler supports data types listed in the following table.
| Data Type | Size | Range of values |
|---|---|---|
| bit | 1 bit | 0 or 1 |
| signed char | 1 byte | -128 to +127 |
| unsigned char | 1 byte | 0 to 255 |
| signed int | 2 bytes | -32768 to +32767 |
| unsigned int | 2 bytes | 0 to 65535 |
| signed long | 4 bytes | -2147483648 to +2147483647 |
| unsigned long | 4 bytes | 0 to 4294967295 |
| float | 4 bytes | ±1,176E-38 to ±3,40E+38 |
| double | 8 bytes | ±1,7E-308 to ±1,7E+308 |
| pointer | 2 or 4 bytes | address of objects |
Data Types for SFR access:
| Data Type | Size | Range of values |
|---|---|---|
| sbit | 1 bit | 0 or 1 |
| sfr | 2 bytes | 0 to 65535 |
- Variables may also be combined into structures and unions. Pointers with multidimensional arrays may be created and variables are accessible. The two special data types (sbit and sfr) enable easier access to the Special Function Register (SFR) of the 80C166 processor. For example, the directive sfr P0 = 0xFF00 defines the variable P0 for PORT0 (address 0xFF00).
- Data types are automatically converted when the result implies another data type. For instance, a bit variable is converted to an integer variable by assignment to an integer variable.
- A sign extension is automatically carried out with signed variables.
These conversions can also be performed manually using standard C language directives.
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