The document is the datasheet of the RP2040 microcontroller, a dual-core ARM Cortex-M0+ chip with 264KB of SRAM, 2MB of on-chip Flash, and various peripherals. The document covers the following topics:
- Introduction: It provides a brief overview of the chip’s features, pinout, and summary.
- System Description: It explains the bus fabric, address map, processor subsystem, DMA controller, memory, boot sequence, bootrom, power supplies, power control, reset, power-on state machine, subsystem resets, and clocks of the chip. It also lists the registers for each component.
- Programmable I/O (PIO): It describes the PIO state machines, instruction set, functional details, and examples of how to use them for different protocols and applications.
- Peripherals: It details the features and registers of the peripherals on the chip, such as GPIO, UART, SPI, I2C, PWM, ADC, RTC, USB, etc.
- Bootrom: It outlines the bootrom functionality and features, such as USB mass storage device mode (UF2), flash programming interface (XIP), and boot order selection.
- Appendix A: Electrical Characteristics: It specifies the absolute maximum ratings, recommended operating conditions, DC characteristics, AC characteristics, and timing diagrams of the chip.
- Appendix B: Package Information: It shows the package dimensions and markings of the chip.
- Appendix C: Availability: It lists the availability status of the chip and its variants.
- Appendix D: Errata: It documents the known issues and workarounds of the chip.
