Pins A4, A5, D4 and D5 expose a second SPI port even though the board specifications mention only one. * However, looking at the schematic of the Minima, only one I☬ port appears to be connected. According to Arduino, these ports are available, at least to some extent. up to six I☬ or SPI ports), and even a smart card interface. An SCI can be either a UART, an I☬ master or a simple SPI port (i.e. The RA4M1 integrates two SPI ports, two I☬ ports plus four serial communication interfaces (SCIs).

These include a CAN bus and USB 2.0 Full-Speed (host or device).Ī USB-C connector replaces the USB-B connector. A 100-pin version exists too, maybe an idea for a new Mega board?), but a few nice ones are. Not all of these are supported by the R4s because not all the pins of the MCU are accessible (it has a 64-pin package. The datasheet is that long because the Renesas MCU features many more peripherals than the Microchip ATmega328. The UNO R4 WiFi is a denser board as it uses the empty board space of the Minima for an 8 by 12 LED matrix and an ESP32-S3-MINI-1 module. The UNO R4 Minima board is of similar design complexity as the R3. However, this touches mainly the software part as indicated by the MCU’s 1400+-page-long datasheet (<300 pages for the ATmega328).

Replacing an old 8-bit, 28-pin controller by a modern 32-bit 64-pin device has, as you may expect, an impact on the complexity of the product. The UNO R4 boards are powered by a Renesas R(7F)A4M1 microcontroller. This makes the MCU a suitable candidate for enhancing the 5-V, 8-bit AVR-based family of which the Arduino UNO R3 is a famous member. Interesting to note is that the RA4M1 can work with a power supply of up to 5 V whereas most other ARM-type microcontrollers require 3.3 V. It seems that a family of Renesas boards is starting to develop. This 32-bit ARM Cortex-M4 runs at 48 MHz and has 32 KB of RAM and 256 KB of flash memory. The two new boards also feature a device from Renesas, the RA4M1. So, now that they really exist, let’s have a closer look at them.Ī few months ago, Arduino released the Portenta C33 board, which has an ARM Cortex-M33 microcontroller from Renesas: the RA6M5. Announced a few months ago, the Arduino UNO R4 Minima and the Arduino UNO R4 WiFi have now been released officially.

Arduino wiring library download