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RTX51 Real Time Kernel

keil RTX51

 

 

RTX51 is a real-time kernel for the 8051 family of microcontrollers that is designed to solve two problems common to embedded programs. 

 

Multitasking: several operations must execute simultaneously.

Real-time control: operations must execute within a defined period of time.

 

    Preemptive task switching and task priorities

    These operations are organized as independent computer processes that are referred to as tasks. While it is possible to implement an embedded program without using a real-time kernel, a well-established, proven kernel, like RTX51, saves time and makes software development easier.

    The RTX (full RTOS) has been discontinued but the RTX-tiny is still available.

 

 

RTX Tiny Features

 

RTX51 Tiny is a small real-time kernel designed for single-chip applications where code size is the most important factor. The RTX51 Tiny kernel requires only 900 bytes of code space and is well-suited for applications that don't need RTOS features like messaging, semaphores, and memory pool management. RTX51 Tiny is included in the PK51 Professional Developer's Kit.  RTX51 Tiny is royalty-free.

 

 

  • RTX and RTX-TINY Specifications

    Feature

    Product

    RTX51

    (discontinued)

    RTX51 Tiny
    (Free in PK51)

    Features

    Kernel Source Code
    t
    t

    Code Banking Support
    t
    t

    CAN Driver
    t
    X

    Multitasking

    Round-Robin
    t
    t

    Preemptive
    t
    t

    Cooperative
    t
    t

    Task Specifications

    Priority Levels

    4

    1

    Defined Tasks (max)

    256

    16

    Active Tasks (max)

    19

    16

    Interrupt Latency
    (In Cycles)

    < 50

    < 20

    Fast Task Switch Time
    (In Cycles)

    70-100

    N/A

    Standard Task Switch Time
    (In Cycles)

    180-700

    100-700

    Memory Requirements

    Code Space

    6K-8K Bytes

    900 Bytes

    Data Space

    40-46 Bytes

    7 Bytes

    Stack (IDATA) Space

    20-200 Bytes

    3 Bytes per task

    XDATA Space

    650 Bytes min

    0 Bytes

    Timers/Signals/Events

    Timeouts
    t
    t

    Intervals
    t
    t

    Signals
    t
    t

    Timer Used

    0,1,2

    0

    System Clock Divisor

    1,000-40,000

    1,000-65,535

    Inter-Task Communication

    Semaphores (binary)
    t
    t

    Semaphores (max)

    8

    		  

    Mailboxes
    t
    t

    Mailboxes (max)

    8

    		  

    Mailbox Size

    8

    		  

    Memory Pools
    t
    t

    Memory Pools (max)

    16