This page provides complete **STC89C52** microcontroller example projects for controlling UIROBOT motors via CAN bus using the **UIM2513** RS232-to-CAN gateway. --- ## Quick Selection | Connection Method | Compatible Products | Docs | |-----------------|-------------------|------| | **STC89C52 → UIM2513 → CAN Bus** | UIM342 (single motor) | [AN250915] | | **STC89C52 → UIM2513 → CAN Bus** | UIM342 (change Node ID) | [AN250916] | | **STC89C52 → UIM2513 → CAN Bus** | UIM342 (multiple motors) | [AN250917] | --- ## Background The UIM342 is a high-performance integrated stepper motor driver designed for applications requiring precise motion control. The UIM2513 is an RS232-to-CAN gateway. By combining an **STC89C52** microcontroller, the **UIM2513** gateway, and **UIM342** motor drivers, users can efficiently create a powerful motion control system using the classic 51 MCU platform. This application manual provides step-by-step instructions for controlling UIM342 motors using STC89C52 and UIM2513. --- ## Required Hardware | Item | Qty | Description | |------|:---:|-------------| | STC89C52 Development Board | 1 | 51 MCU development board | | UIM2513 | 1 | RS232 to CAN gateway | | UIM342 Series Motor | 1+ | CAN bus smart motor | | 24V DC Power Supply | 1 | For motor power | | USB-TTL Converter | 1 | For programming STC89C52 | | RS232-TTL Converter | 1 | For UART communication | | Keil uVision5 | 1 | IDE (install on PC) | | STC-ISP Tool | 1 | Program download tool | --- ## Wiring ### Wiring Diagram 1 — Code Download Mode  ### Wiring Diagram 2 — System Operation Mode  ### Communication Flow ``` STC89C52 (UART/TTL) │ TXD/RXD ▼ UIM2513 (RS232 → CAN Gateway) │ CANH/CANL ▼ UIM342 Motor (CAN Bus) ``` --- ## Sample Code ### Download Links | Application Note | Description | Download | |-----------------|-------------|----------| | AN250915 | UIM342 basic control (STC89C52) | [Download](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_AN250915.zip) | | AN250916 | UIM342 change Node ID | [Download](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_ChangeNodeID_AN250916.zip) | | AN250917 | UIM342 multi-motor control | [Download](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_Multiple_AN250917.zip) | > **Note**: The actual sample code is provided in the ZIP files above. The code snippet above illustrates the general structure. --- ## Step-by-Step Setup ### Step 1 — Install Keil uVision5 1. Visit the official Keil website: [keil.com](https://www.keil.com/) 2. Navigate to **Downloads → Product Downloads → MDK Arm** 3. Download and install Keil uVision5 ### Step 2 — Download Sample Code 1. Visit [uirobot.com](https://uirobot.com) 2. Navigate to **Support → Code Example** 3. Find the STC89C52 section and download the appropriate sample code 4. Extract the downloaded ZIP file ### Step 3 — Configure Keil Project 1. Open the `.uvproj` project file in Keil uVision5 2. Select **Project → Options for Target** 3. In the **Output** tab, check **"Create HEX File"** 4. Click **OK** to confirm ### Step 4 — Compile Code 1. Click **Build** (or press F7) to compile the project 2. Confirm that the HEX file has been generated successfully 3. The HEX file is located in the project's output folder ### Step 5 — Download Code to STC89C52 1. Connect hardware according to **Wiring Diagram 1** (code download mode) 2. Open **STC-ISP** tool (e.g., `STC-ISP-v6.95D.exe`) 3. Close any pop-up windows 4. Configure the tool: - Select the correct **chip model** (STC89C52 series) - Select the correct **COM port** - Click **"Open Code File"** and select the generated HEX file 5. Configure additional options as needed 6. Click **"Download/Program"** 7. **Power off and on** the system board within 1-2 seconds after clicking download ### Step 6 — System Operation 1. Reconnect hardware according to **Wiring Diagram 2** (operation mode) 2. Power on the system board 3. The STC89C52 will execute the code automatically 4. The UIM342 motor will respond to the programmed commands --- ## Download All Sample Codes | Application Note | Description | Download Link | |-----------------|-------------|---------------| | AN250915 | UIM342 basic control (STC89C52) | [Download ZIP](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_AN250915.zip) | | AN250916 | UIM342 change Node ID | [Download ZIP](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_ChangeNodeID_AN250916.zip) | | AN250917 | UIM342 multi-motor control | [Download ZIP](https://www.uirobot.com/uploads/files/STC89C52_C_UIM2513_UIM342_Multiple_AN250917.zip) | --- ## Related Documents - [UIROBOT Code Examples Overview](/docs/code-examples-overview) - [Arduino CAN Bus Examples](/docs/arduino-examples) - [Raspberry Pi 4 CAN Bus Examples](/docs/raspberry-pi-examples) - [UIM2513 CAN Bus Gateway](/docs/uim2513) - [UIM342 CAN Bus Motor Controller](/docs/uim342) - [Quick Start Guide](/docs/quick-start) --- *Last updated: 2026-06-25 | Based on Application Notes AN250915-AN250917*