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Motor controller (unpotted):
Microcontroller is the STC15W4K32S4, based on a 8051 CPU, runs at 35 MHz and has 32 kbytes of flash memory.
- Product page: https://www.stcmicro.com/STC/STC15W4K32S4.html
- Datasheet: STC15W4K32S4-en.pdf
- There is a cheap 3€ development board available on Aliexpress, search for "system board IAP15W4K58S4 core board STC15W4K56S4"