Embedded Systems · 8051 / MCS-51

Engineering
Real-Time on 8051.

A complete operating system for 8051 microcontrollers. HRTOS brings structured multitasking, interrupt management and practical embedded software components to a long-established 8-bit architecture.

Explore HRTOS Technical Documentation

PROJECT ORIGIN: 2017

8051 Native Deterministic Scheduling Embedded Ecosystem

TASK CONTROL INTERRUPT FLOW RESOURCE MODEL 8051 CORE

HRTOS REAL-TIME SYSTEM

The Product

A complete system.
Built for 8051.

HRTOS is designed specifically for the 8051 / MCS-51 family. It provides an organized software foundation for applications that need multiple tasks, predictable coordination and efficient access to microcontroller resources.

Rather than treating the 8051 as a platform of isolated bare-metal routines, HRTOS provides a coherent system model for building and maintaining embedded applications.

Product Overview

HRTOS · SYSTEM CAPABILITIES

// A structured embedded application

Task Management
  ├─ Task creation and scheduling
  ├─ Priority-based execution
  └─ Time and event-based waiting

System Services
  ├─ Semaphores and mutexes
  ├─ Events and message queues
  └─ Interrupt coordination

Application Layer
  ├─ Peripheral drivers
  ├─ Communication components
  └─ Reusable application examples

Core Capabilities

System services for real embedded work.

HRTOS combines core operating-system mechanisms with practical services for organizing 8051 applications. Explore the individual capabilities and their implementation.

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Task Scheduling

Priority-based task management and time-driven scheduling help structure concurrent application behavior.

Explore Scheduling

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Interrupt Management

Dedicated interrupt handling mechanisms support responsive interaction with hardware events.

Explore Interrupts

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Synchronization

Semaphores, mutexes and events provide coordination mechanisms for tasks and shared resources.

Explore Synchronization

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Inter-task Communication

Message queues and mailboxes help exchange data between independent parts of an application.

Explore Communication

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Resource Management

System resource services help applications manage limited memory and microcontroller resources.

Explore Resources

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Practical Components

Drivers, communication modules and application examples provide a foundation for real projects.

Explore Drivers

System Architecture

Designed around the realities of 8-bit computing.

The 8051 is resource-constrained. Its memory spaces, register banks, interrupt behavior and compiler toolchain all matter. HRTOS is developed with these architectural constraints in mind.

The system architecture separates kernel services, hardware adaptation and application-level components, making projects easier to organize and maintain.

Explore Architecture

CONCEPTUAL SOFTWARE LAYERS

Application
  User tasks · Examples · Shell
          ▲
System Services
  Time · Wait · IPC · Synchronization
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HRTOS Kernel
  Scheduler · Task context · Interrupts
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Hardware Adaptation
  HAL · MCU-specific drivers
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8051 / MCS-51 Microcontroller

Measured Performance

Engineering claims backed by test data.

Performance should be understood in the context of a specific MCU, clock frequency, compiler configuration and test method. HRTOS publishes measured results rather than implying one universal figure for every 8051 device.

12.167 µs Measured ISR execution time

394.33 µs Normal task switch · Scheduling-flag path

143.5 µs Fast task switch · Scheduling-flag path

Reference test platform: STC12C5A60S2, 1T mode, 11.0592 MHz. Values are platform- and test-condition-specific. Consult the detailed Performance documentation for measurement definitions and additional results.

Performance Center View Benchmarks

Hardware Support

Developed for the 8051 platform.

HRTOS focuses on the 8051 / MCS-51 architecture and selected microcontroller platforms. Explore hardware information, platform considerations and test environments.

STC12 Series

Reference hardware for system functionality, timing measurements and performance evaluation.

View STC12 Information

STC8 Series

Hardware resources and testing considerations for newer STC 8051 microcontrollers.

View STC8 Information

Hardware Overview

Review supported hardware information and platform-related development resources.

Explore Hardware

Embedded Ecosystem

From kernel mechanisms to application examples.

A useful operating system is more than its scheduler. HRTOS is building a practical collection of drivers, communication components and reusable examples around the 8051 platform.

Sensor Drivers Temperature, gas, light and other sensing modules.

Communication UART-based modules and Modbus RTU components.

Display Display interfaces and human-readable output.

Application Examples Practical demonstrations connecting drivers and tasks.

Driver Library Application Examples

Explore the Website

Everything you need to explore HRTOS.

Navigate the HRTOS website to learn about the product, understand its technical design, review hardware support and access practical development resources.

01 / PRODUCT

Product Center

Discover HRTOS, its system capabilities, product information and release history.

Explore Product

02 / FEATURES

Core Features

Explore task scheduling, interrupt management, synchronization and communication services.

Explore Features

03 / ARCHITECTURE

System Architecture

Understand the kernel, memory model, task management and system resource organization.

Explore Architecture

04 / PERFORMANCE

Performance Center

Review benchmarks, context switching, interrupt latency and timing accuracy.

View Performance

05 / HARDWARE

Hardware Support

Learn about supported 8051 hardware platforms and test environments.

Explore Hardware

06 / DRIVERS

Driver Library

Explore reusable sensor drivers, communication components and display support.

Explore Drivers

07 / EXAMPLES

Application Examples

Study practical examples involving infrared, sensors, displays and Modbus.

View Examples

08 / DOCUMENTATION

Technical Documentation

Access getting-started guides, installation instructions, API references and FAQs.

Read Documentation

09 / DOWNLOAD

Downloads

Find HRTOS packages and available project resources for development.

View Downloads

The HRTOS Project