---
title: "Embedded 101: Decode RP2040 & RP2350 Naming Rules"
url: "https://maker.wiznet.io/ruilixin6/projects/understand-raspberry-pi-chip-naming-in-1-minute-full-analysis-of-the-numerical-meanings-behind-rp20/"
markdown_url: "https://maker.wiznet.io/ruilixin6/projects/understand-raspberry-pi-chip-naming-in-1-minute-full-analysis-of-the-numerical-meanings-behind-rp20/md"
type: "UCC: User Created Content"
author: "FreakStudio"
author_url: "https://maker.wiznet.io/ruilixin6/"
original_author: "FreakStudio"
published: "2026-07-28"
language: "en"
tags: ["embedded-systems"]
likes: 0
views: 127
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Embedded 101: Decode RP2040 & RP2350 Naming Rules

> This article introduces the naming rules of Raspberry Pi RP-series MCUs and explains how to decode core hardware parameters from RP2040 and RP2350 model numbers

Original author: FreakStudio

## Article

## 【Preliminary Note】The original hardware example in this article was written based on the RP2040. The actual hardware used in this hands-on demonstration features the W55RP20 as the main controller chip. The circuit logic and UF2 flashing operation principles are universally applicable, with only the main controller model differing. The original chip model mentioned in the circuit descriptions below is provided for reference purposes only.

![](https://maker.wiznet.io/upload/ckeditor5/188065550%5F1785351550%2Epng)

There is a set of extremely simple coding rules hidden in the RP series microcontroller models of Raspberry Pi. As long as you remember these 5 positions, you can instantly understand the hardware parameters without checking the datasheet!

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260645%2Ejpg)

### First, let's look at the overall structure: RP + 4-digit number

All Raspberry Pi MCU models follow the `RPXXXX `format:

`RP`: Abbreviation for Raspberry Pi, enabling instant brand recognition

The last four digits respectively correspond to **the number of cores, core type, RAM capacity, and Flash capacity **four core hardware parameters

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260666%2Ejpg)

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260675%2Ejpg)

### Bit by Bit: Decoding Hardware Specifications from Numbers

Taking the RP2040 and RP2350 as examples, let's break down the meaning of each bit one by one:

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260709%2Epng)

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260720%2Ejpg)

![](https://maker.wiznet.io/upload/ckeditor5/1047938803%5F1785260736%2Ejpg)

### Quick Memory Tips

**Number of cores**: Currently all RP series products are dual-core, so the first digit is always 2

**Kernel Type**: The numbers correspond to the Cortex-M series, where 0 = M0+ and 3 = M33; new kernel models will be assigned new corresponding numbers

**RAM Calculation**: Directly apply the formula `RAM = 16kB × 2^encoding value`, e. g., encoding 4 → 256KB, encoding 5 → 512KB

**Flash Identification**: As long as the 4th bit is 0, it indicates that this chip **has no onboard Flash **and requires external storage.

### To sum up: Understand the model at a glance

**RP2040**: Dual-core Cortex-M0+, 256KB RAM, no onboard Flash

**RP2350**: Dual-core Cortex-M33,512KB RAM, no onboard Flash

Next time you come across models starting with RP, you can directly figure out their core hardware configuration without even consulting the manual!

---

Source: https://maker.wiznet.io/ruilixin6/projects/understand-raspberry-pi-chip-naming-in-1-minute-full-analysis-of-the-numerical-meanings-behind-rp20/