The standard JTAG interface is 4 wires: TMS, TCK, TDI, TDO, which are the mode selection, clock, data input and data output lines respectively. The definition of related JTAG pins is: TCK: clock input; TDI: data input, data is input to the JTAG interface through the TDI pin;JTAG (named after the Joint Test Action Group which codified it) is an industry standard for verifying designs of and testing printed circuit boards after manufacture. JTAG implements standards for on-chip instrumentation in electronic design automation (EDA) as a complementary tool to digital. The core of STM32H74xI/G and STM32H75xI/G devices integrates the Serial Wire/JTAG Debug Port (SWJ-DP). It is an ARM® standard CoreSight™ debug port that combines a 5-pin JTAG-DP interface and a 2-pin SW-DP interface. 1 compatible), which is mainly used for internal chip testing. Now most advanced devices support JTAG protocol, such as ARM, DSP, FPGA devices and so on. For Cortex-M boards, start with SWD plus nRESET. can you support me how to connect or which pins to be used and what is the procedure to change from SWD to JTAG mode? Regards, Nikhil 2024-07-15 4:57 AM - edited 2024-07-15 5:08 AM > SWD connection. JTAG is a technology to test integrated circuits, mostly micro-controllers and CPUs. It allows to do hardware debugging: read/write memory, control I/Os, and debug running code.