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Pin problem of SMD STC89C52RC-40C-LQFP44
This is a chip package and there is no IC socket. If welding by hand, fix the two pins of IC before welding. As for the frequency and working voltage of the crystal oscillator, you can refer to its data sheet. But the working voltage of 7V is definitely not acceptable. You can go to the official website of STC to find these materials.