ST Emulator Interface Description

ST emulators, such as ST-LINK/V2 and ST7-EMU3, provide in-circuit debugging and programming for STM8, STM32, and ST7 microcontrollers using interfaces like SWIM, SWD, and JTAG.

ST-LINK/V2 Interface

The ST-LINK/V2 is an in-circuit debugger and programmer for STM8 and STM32 microcontrollers. It communicates with target microcontrollers using:

• SWIM (Single Wire Interface Module) for STM8 devices
• SWD (Serial Wire Debug) and JTAG for STM32 devices The device connects to a PC via USB full-speed interface and integrates with development environments such as STM32CubeIDE, ST Visual Develop (STVD-STM8), or ST Visual Programmer (STVP-STM8). The ST-LINK/V2-ISOL variant adds digital isolation, protecting the PC and target board from voltages up to 1000 V rms, which is useful for sensitive or high-voltage applications. The debugger can communicate with targets operating below 3.3 V, generating output signals at this voltage level, and is compatible with both official ST boards and third-party development boards .

Connection Details

• SWD 4-pin header: Ground, +3.3V, clock, and data pins. This is the simplest connection for most development boards .
• 20-pin JTAG header: Used when a full JTAG interface is required.
• On Nucleo or Discovery boards, the ST-LINK/V2 is built-in and can be used directly via USB without an external debugger .

ST7-EMU3 Interface

The ST7-EMU3 is a dedicated emulator for ST7 microcontrollers. It provides two main configurations:

1. Emulation Configuration: Uses the emulator probe and ST7 Visual Develop (STVD7) software to build and debug applications with advanced breakpoints and performance analysis.
2. In-Circuit Communication (ICC) Configuration: Uses the ICC Add-on and STVD7 to debug and program the ST7 microcontroller while it runs on the target board, integrating with ST7 Visual Programmer (STVP7) . The ST7-EMU3 connects to the target via the ST Micro Connect box, which serves as the common hardware interface for both emulation and in-circuit debugging. This setup allows full control over application development, from building and debugging to programming the microcontroller .

Summary

ST emulators provide a robust interface for debugging and programming ST microcontrollers:

• ST-LINK/V2: Supports STM8/STM32, SWIM/SWD/JTAG, USB connection, optional isolation.
• ST7-EMU3: Supports ST7, emulation and ICC modes, integrates with STVD7/STVP7 software. These interfaces allow developers to program, debug, and monitor microcontroller applications efficiently, whether on official ST boards or third-party development boards. Proper connection and software setup ensure safe and effective debugging and programming operations .