Read data from microcontroller

How can i controll and read data from microcontroller with D1 MINI and ESPHome.
I want read data from a microcontroller in washing machine.

What do you want to read?

Remaining washing time, program type etc and want start remotely.

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You got any docs for that chip?

What i need more. Is the chip pinout not enough.

Well you need some info about what each pin does. I mean there are two UARTs for serial communication, I would start there.

By the way I think this is the datasheet. R5F21276SNFP datasheet or https://z3d9b7u8.stackpathcdn.com/pdf-down/R/5/F/R5F21276_Renesas.pdf

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