Interface: SWD interface with four wires—VCC (3.3V), GND, SWDIO (TMS/DIO), SWCLK (TCK/CLK). Designed for evaluation boards ("on-board") from major semiconductor manufacturers—the "OB" suffix denotes on-board integration. This USB-based debug probe, named "ARM-OB", connects to a PC via USB and interfaces with target devices using SWD (Serial Wire Debug) for programming, debugging, and firmware download. Compared to standard OB debuggers, this version supports SWD only (no JTAG), optimized for ARM-based microcontrollers with SWD capability—including ARM7, ARM9, Cortex-M0/M1/M2/M3/M4, and Cortex-A5/A8/A9 cores. Compatible with MCUs from STMicroelectronics, NXP, Texas Instruments, Cypress, Microchip (Atmel), Analog Devices, Fujitsu, Toshiba, Silicon Labs (Energy Micro), and Nuvoton. Compared to J-Link OB and ST-Link V2: stable firmware with automatic update support; compact USB-stick form factor for portability. Color: Blue Material: Polycarbonate + metal Connection mode: SWD only Functions and performance: - Programming: Flash ROM, EEPROM, and option byte programming. - Debugging: Full-speed run, single-step execution, breakpoint setting, I/O monitoring, and variable inspection. - Programming speed: High-speed SWD download via USB 2.0. - Debugging speed: Responsive real-time simulation via USB 2.0. Key features: - Simplified interface