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Some key specs:
  • SoC:
    • name: RP2040. Custom designed by Raspberry Pi Foundation, likely the first they make themselves rather than using a Broadcom chip. But the design still is closed source, likely wouldn't be easy to open source due to the usage of closed proprietary IP like the ARM
    • dual core ARM Cortex-M0+
    • frequency: 2 kHz to 133 MHz, 125 MHz by default
    • memory: 264KB on-chip SRAM
  • GPIO voltage: 3.3V
Datasheet: datasheets.raspberrypi.com/pico/pico-datasheet.pdf
Figure 6. Source.

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