The RA4M1 is the Renesas microcontroller family used as the main MCU of the Arduino UNO R4 WiFi (part R7FA4M1AB3CFM#AA0). On that board it runs an Arm Cortex-M4 core at 48 MHz with an FPU and operates its I/O at 5 V for shield compatibility.
This page records only what the currently admitted official sources (the Arduino board documentation) state about the chip itself. Deeper details — the full peripheral inventory, DMA capabilities beyond "4x DMAC", electrical limits — live in the Renesas RA4M1 datasheet, which is not yet an admitted source here; those figures are left out rather than filled in from memory.
Capabilities
| Capability | What the sources say | Source |
|---|---|---|
| core | Arm Cortex-M4 with FPU, 48 MHz Datasheet: "48 MHz Arm® Cortex®-M4 microprocessor with a floating point unit (FPU)" on the UNO R4 WiFi. | Arduino UNO R4 WiFi documentation (datasheet and tech specs) · content/hardware/uno/boards/uno-r4-wifi/datasheet/en-datasheet.md#L152-L168 |
| memory | 256 kB flash / 32 kB SRAM / 8 kB data flash (EEPROM) Datasheet feature list; the 8 kB data flash backs the EEPROM emulation library. | Arduino UNO R4 WiFi documentation (datasheet and tech specs) · content/hardware/uno/boards/uno-r4-wifi/datasheet/en-datasheet.md#L152-L168 |
| peripherals | RTC; 4x DMAC; 14-bit ADC; up to 12-bit DAC; OPAMP; CAN bus Datasheet feature list for R7FA4M1AB3CFM#AA0. | Arduino UNO R4 WiFi documentation (datasheet and tech specs) · content/hardware/uno/boards/uno-r4-wifi/datasheet/en-datasheet.md#L152-L168 |
| operating_voltage_v | 5 Datasheet: operating voltage "fixed at 5 V as to be hardware compatible with shields" of previous UNO boards. | Arduino UNO R4 WiFi documentation (datasheet and tech specs) · content/hardware/uno/boards/uno-r4-wifi/datasheet/en-datasheet.md#L152-L168 |
Where this chip is used
Boards using this chip
Also known as: r7fa4m1ab3cfm, ra4m1