M3S-T4-Tiny for RX Family (hereafter abbreviated "T4") is a communications protocol software library for RX Family. It makes TCP/IP communication possible in an Ethernet-connected network for all types of equipment that incorporates RX MCUs.


M3S-T4-Tiny V.2.09 released. The TCP Keep-Alive function has been added.

Release Information

Latest Ver.: V.2.09 Release 00

Released: Aug 30, 2019

Details of upgrade (See Application Note)

Obtaining the Product


  • Memory-saving compact design (TCP/IP protocols processable by the internal memory of the microcontroller)
  • OS's unnecessary
  • Compliant with ITRON TCP/IP API specification
  • We have prepared a wrapper which converts the specifications of the ITRON TCP/IP API into those of a socket API.
  • Sample driver for LAN controller available
  • Efficient development through a combined use of Renesas development tools supported
  • We provide a range of the Sample Code for T4 as an Application Note.


  • TCP/IP protocol stack software (library in binary form)
  • Various sample driver software*
  • TCP/IP protocol stack sample program
  • TCP/IP protocol stack manual and other documents in a complete set

* The sample drivers are verified their running on the evaluation boards placed in the Operating Environment.

Operating Environment

  • CS+ for CC V8.01.00
  • e2 studio V7.3.0
  • IAR Embedded Workbench for Renesas RX 4.11.01
C Compiler
Debugger (Optional)
Evaluation Board Ethernet:
SDIO Wireless LAN Expansion Board Wireless LAN expansion board package for RSK (includes Wireless LAN module (eWBC))(Part Number: RTK0ZZZZZZP00000BR)
Included Sample Driver RX Family Ethernet Controller Driver

Obtaining the Product


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