[Marius Taciuc’s] latest endeavor, the B4 Thinker, offers a captivating glimpse into microcontroller architecture ... So we see a lot of 4-bit CPUs. Some even use discrete transistors.
the fastest microcontroller you can get in 2019 ... Besides ten more GPIO pins, there are pads for an SD card interface using 4-bit SDIO, and D+ and D- lines for the second 480 Mbps USB interface.
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