HiFive1 (Discontinued)

Freedom Everywhere

SiFive HiFive1 is an Arduino-compatible development board featuring the SiFive Freedom E310 (FE310) SoC, making it the best way to prototype and develop RISC-V software.

HiFive1 Features and Specifications

Designed for microcontrollers and edge computing, the FE310 instantiates a SiFive Essential™ E3 Series CPU Core Complex, a high performance 32-bit RV32IMAC core. Additional features include a 16KB L1 Instruction Cache, a 16KB Data SRAM scratchpad, hardware multiply/divide, a debug module, flexible clock generation with on-chip oscillators and PLLs, and a wide variety of peripherals including UARTs, QSPI, PWMs, and timers. Multiple power domains and a low-power standby mode ensure a wide variety of applications can benefit from the FE310. Software development is accelerated with the onboard FTDI FT2232 JTAG debugger connecting over USB to SiFive Freedom Studio, an Eclipse-based IDE. Additionally, your JTAG probe of choice can be connected and used with your favorite debugger and IDE. Freedom Studio is packaged with a prebuilt toolchain and example software projects. Alternatively, the SiFive Freedom Tools download package includes a pre-built toolchain, debugger, and additional command line tools that can be plugged into your own bespoke development environment.



Operating Voltage

3.3 V and 1.8 V

Input Voltage

5 V USB or 7-12 VDC Jack

IO Voltages

Both 3.3 V or 5 V supported

Digital I/O Pins


PWM Pins


SPI Controllers/HW CS Pins


External Interrupt Pins


External Wakeup Pins


Flash Memory

128 Mbit Off-Chip (ISSI SPI Flash)

Host Interface (microUSB)

Program, Debug, and Serial Communication


22 g


68 mm


51 mm



Freedom E310


New Version of HiFive1 Available

  • Hardware I2C to read from digital sensors
  • Additional UART to communicate with other peripherals
  • Low-power sleep mode, keeping only the minimal amount of logic in the Always-On domain powered
  • On board wireless networking
Check Out HiFive1 Rev B
For those following the RISC‑V space, SiFive’s new Freedom E310 is a long-awaited milestone.
William Wong — Technical Editor, Penton Media
SiFive is providing innovative solutions that will fundamentally change the semiconductor industry.
Stefan Dyckerhoff — Sutter Hill Ventures, Managing Director