Get ULINK2, please see here: 1. First install the MDK software in the CD, the first time you use the ulink2 driver will automatically install the ULINK2 driver here: C:////Keil////ARM////ULINK (keil default installation directory); Ulink2 connected to the computer instantly: COM, RUN led will flash at the same time 2. The settings do not understand can see ULINK2 manual: C: ////Keil////ARM////Hlp////ULNK2.chm (keil default installation directory); Win7 customer that harmonious file to use "run with administrator privileges" / operating system to minimize permissions, restart the computer before running MDK registration service. 3. SWD and SWV wiring instructions: Wiring SW mode: SWCLK, SWD, GND, a total of 3 lines, are indispensable; SWV mode needs to increase SWO; (If the download appears: Contents missmatch at: 0800005DH (Flash=FFH Required=18H) ! Please connect the reset pin to this error!) 4. The function is fully compatible, can be seamlessly connected with the latest version of MDK software. support firmware firmware automatic upgrade. After long-term verification, the performance is stable without any abnormality. the quality is absolutely guaranteed, the best cost performance. JTAG and SW interface clock TCK speed can reach 10MHz (speed and 12MHz after JLINK V8) Precautions: 1, support MDK3.8a, 4.0x, 4.1x, 4.20, 4.21, 4.22, 4.23, 4.50, 4.53, 4.54, 4.60 upgrade! And later version of keil software! Please use MDK3.8a or above! 2, if the simulation ARM Cortex-M4 is best to use the latest MDK4.23 (keil for arm) software above The kEIL ARM emulator is the latest emulator for ARM used by RealView MDK and is an upgraded version of the ULink emulator. The kEIL ARM emulator not only has all the features of the ULINK emulator, but also adds support for serial debugging (SWD), return clock support and real-time proxy. Developmentengineers can easily perform on-chip debugging (using on-chip JTAG, SWD and OCDS