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Feature

64K flash memory, 20K SRAM.
The Board lead to all the I/O resources.
Download with SWD debug interface, which requires a minimum of 3 wires to complete debug a download task
Use the current smart phones of Mirco USB interface, easy to use, USB communication and power supply can be done.
It could be used for MCU-based basic circuits, such as a crystal oscillator circuit, USB interface and USB power management circuits.