CH55x is a 51 microcontroller with USB from WCH. Known as the cheapest USB interface microcontroller. This development board is compatible with a total of 4 models of CH55x.
Among them, CH552T and CH554T are pin2pin of SSOP20. CH558T and CH559T are pin2pin of TSSOP20. For compatible design, the pad pins of SSOP20 have been widened.
To use the corresponding model, just black out the unnecessary IO numbers.
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