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C251 User's Guide
C251 Introduction Compiling Programs 
Language Extensions 
Keywords Memory Areas Program Memory Internal Data Memory External Data Memory Near Memory Far Memory Huge Memory SFR Memory Memory Models Tiny Model XTiny Model Small Model XSmall Model Large Model Memory Types Implicit Memory Types bdata code data ebdata far huge idata near xdata Data Types Special Function Registers sfr sfr16 sbit Bit-Addressable Objects bit Standard C Types void char int enum float double Type Modifiers signed unsigned short long Type Qualifiers const volatile Storage Classes auto register extern static Absolute Variable Location Pointers Memory Type in Pointer Declarations Pointer Conversions Function Declarations Memory Models Register Banks Interrupt Functions Reentrant Functions Alien (PL/M-51) Function Real-Time Function Tasks Preprocessor Advanced Programming Error Messages Library Reference AppendixReal-Time Function Tasks
The C251 Compiler supports the RTX251 Full and RTX251 Tiny real-time multitasking operating systems with the _task_ and _priority_ keywords.
- The _task_ keyword specifies a function is a real-time task.
- The _priority_ keyword specifies the priority for the task.
For example:
void func (void) _task_ num _priority_ pri
Where
| num | is a task ID number from 0-255 for RTX251 Full or 0-15 for RTX251 Tiny. |
| pri | is the priority for the task. Refer to the RTX51 Tiny User's Guide for more information. |
Note
- Task functions must be declared with a void return type and a void argument list.
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