RL78/F15 automotive microcontrollers employ the RL78 core, which realizes high processing performance while delivering the lowest power consumption in its class. A high-speed on-chip oscillator provides 32MHz CPU operation. An enhanced motor control functionality is offered by the motor control timer (Timer RD). For easy migration, RL78/F15 is pin and software upwards compatible with RL78/F14. The RL78/F15 Group even supports 125 ℃ (target) operation, whereby a CPU clock of 24 MHz can be reached. In addition, an abundance of functions to support functional safety, like ECC on RAM and a stack pointer monitor as well as an A/D converter testing function are available. With packages from 48 to 144-pin, a memory range from 128KB to 512KB flash, and advanced IPs for LIN and 2 channels of CAN communication and IEBus, these products are very well suited for a broad range of cost-sensitive automotive applications like DC and BLDC motor control, HVAC, lighting and many kinds of body applications. Design resources are available here to help you get your design to market as quickly as possible.
Documents
We have placed all related primary documentation on this page such as user's guides, application notes and collateral.
User Manuals
- RL78/F15 User's Manual: Hardware Rev.1.00 (PDF | English, 日本語)
- RL78 Family User's Manual: Software Rev.2.30 (PDF | English, 日本語)
Electrical Characteristics
Collateral Materials
Application Notes
CAN
- RL78/F13, F14, F15 CAN configuration, reception and transmission Rev.2.00 (PDF | English, 日本語)
- CAN Controller Usage: Applications and Frequently Asked Questions Rev.2.03 (PDF)
Clock
Communication
- RL78/F13,F14,F15 Setup Procedures for IICA Multi-Master Communication Rev.1.00 (PDF | English, 日本語)
- RL78/F15 IEBus Setup Procedures for IEBB Master Transmission/ Slave Reception Rev.1.00 (PDF | English, 日本語)
- RL78/F15 IEBus Setup Procedures for IEBB Master Transmission/ Slave Reception Employing DTC Rev.1.00 (PDF | English, 日本語)
- RL78/F13,F14,F15 SENT (Single Edge Nibble Transmission) Communication Application Notes Rev.1.00 (PDF | English, 日本語)
CRC
CSI
- RL78/G14, RL78/G1C, RL78/L12, RL78/L13, RL78/L1C, RL78/G23 Group Clock Synchronous Single Master Control Software Using CSI Mode of Serial Array Unit Rev.1.07 (PDF | English, 日本語)
Current
- RL78 Minimizing Power Consumption when Sensing Switch Inputs Rev.1.00 (PDF)
- RL78/F13, F14 Standby Function Rev.1.00 (PDF | English, 日本語)
- Current Consumption Tuning Solution for RL78 family (E2 Emulator,CS+) Rev.1.00 (PDF | English, 日本語)
- Current Consumption Tuning Solution for RL78 family (E2 Emulator, e² studio) Rev.1.00 (PDF | English, 日本語)
DAC
DTC
- RL78/F13, F14 DTC Usage Example (High-Speed Transfer): A/D Converter Rev.1.00 (PDF | English, 日本語)
- RL78/F13, F14 DTC Usage Example (High-Speed Transfer and Chain Transfer) Rev.1.00 (PDF | English, 日本語)
- RL78/F13, F14 DTC Usage Example (Normal Transfer): A/D Converter Rev.1.00 (PDF | English, 日本語)
Flash
- RL78 Microcontrollers (RL78 Protocol A) Programmer Edition Application Note Rev.1.00 (PDF | English, 日本語, 简体中文)
- 78K0, 78K0R, RL78 and V850 Devices Flash Protection and Security Setting Guide Rev.1.01 (PDF)
- Renesas Flash Programmer Usage from the Command Line (PDF | English, 日本語)
H/W Design
- HARDWARE DESIGN GUIDE RL78/F13, F14, F15 Rev.1.00 (PDF | English, 日本語)
- PCB-Design for Improved EMC (PDF)
- RL78 Family Notes and Countermeasures Against Noise Rev.1.00 (PDF | English, 日本語, 简体中文)
Interrupt
LIN
- RL78/F13, F14 Group LIN Master Mode (RLIN3) Rev.1.01 (PDF) [Sample Code]
- RL78/F13, F14 Group LIN Slave Mode (RLIN3) Rev.1.02 (PDF) [Sample Code]
- LIN Controller Usage: Applications and Frequently Asked Questions Rev.2.01 (PDF)
- RL78/F13, F14, F15 Setup Procedure for LIN Communication in Slave Mode (Guidance) Rev.1.00 (PDF | English, 日本語)
- RL78/F13, F14, F15 Setup Procedure for LIN Communication in Master Mode (Guidance) Rev.1.00 (PDF | English, 日本語)
Motor Control
- Motor control by RL78/F14 micro controller 120 degrees conducting control of blushless DC motor with hall sensor Rev.1.00 (PDF | English, 日本語) [Sample Code]
- Motor control by RL78/F14 micro controller sensorless 120 degrees conducting control of blushless DC motor (A/D) Rev.1.00 (PDF | English, 日本語) [Sample Code]
- Motor control by RL78/F14 micro controller sensorless 120 degrees conducting control of blushless DC motor (COMP) Rev.1.00 (PDF | English, 日本語) [Sample Code]
- RL78 BLDC Motor Control Rev.1.00 (PDF)
- Motor control by RL78/F14 micro controller Sensorless vector control of permanent magnetic synchronous motor Rev.1.00 (PDF | English, 日本語) [Sample Code]
Option Byte
Pin
PORT
- RL78/F13,F14 Settings of port-related registers when using alternate functions Rev.1.00 (PDF | English, 日本語)
Porting Guide
- Replacement Guide from 78K0 Family to RL78 Family (CcnvCA78K0) Rev.1.00 (PDF | English, 日本語, 简体中文) [Sample Code]
- Porting Giude from M16C/5M, 57 to RL78/F13, F14, F15 Rev.1.00 (PDF | English, 日本語)
- Replacement Guide for R8C Family to RL78 Family (CcnvNC30) Rev.1.00 (PDF | English, 日本語, 简体中文) [Sample Code]
PWM
RAM
RTC
Safety
Sound
SW
- RL78 Family C compiler CC-RL Programming Techniques Rev.1.10 (PDF | English, 日本語)
- RL78 Family CubeSuite+ Startup Guide Rev.1.00 (PDF | English, 日本語)
- RL78 Family RL78 Digital Signal Controller Library - Filter Rev.2.01 (PDF | English, 日本語) [Sample Code]
- RL78 Family FFT Library: Deployment Guide Rev.1.05 (PDF | English, 日本語) [Sample Code]
- IAR Embedded Workbench for RL78 Programming Techniques Rev.1.00 (PDF)
- RX Family, RL78 Family, 78K0R/Kx3-L Micron Technology P5Q Serial Phase Change Memory Control Software Rev.1.04 (PDF | English, 日本語) [Sample Code]
- RL78 Family Open Source FAT File System M3S-TFAT-Tiny: Introduction Guide Rev.2.00 (PDF | English, 日本語) [Sample Code]
- Random Number Generator Rev.1.02 (PDF)
- IEC60730/60335 Self Test Library of CARL78 for RL78 MCU extended Application Notes (R01AN4823EJ0110) Rev.1.10 (PDF | English, 日本語) [Sample Code]
- IEC60730/60335 Self Test Library of CCRL78 for RL78 MCU extended Application Notes (R01AN4819EJ0110) Rev.1.10 (PDF | English, 日本語) [Sample Code]
- RL78 Software Migration Guide Source Code Migration from Assembly Language to C Language CC-RL Rev.1.01 (PDF | English, 日本語, 简体中文)
- RL78 Software Migration Guide Migrating from CA78K0R to CC-RL (CS+) Rev.1.00 (PDF | English, 日本語, 简体中文)
- RL78 Family VDE Certified IEC60730/60335 Self Test Library (R01AN0749EG0201) (PDF) [Sample Code]
- RX Family, RL78 Family, 78K0R/Kx3-L Spansion S25FLxxxS MirrorBit® Flash Non-Volatile Memory Control Software Rev.1.04 (PDF | English, 日本語) [Sample Code]
- RX Family, RL78 Family, 78K0R/Kx3-L Renesas R1EX25xxx Series Serial EEPROM Control Software Rev.1.06 (PDF | English, 日本語) [Sample Code]
- RX Family, RL78 Family, 78K0R/Kx3-L Micron Technology N25Q Serial NOR Flash Memory Control Software Rev.1.04 (PDF | English, 日本語) [Sample Code]
- RX Family, RL78 Family, 78K0R/Kx3-L Micron Technology M45PE Series Serial Flash memory Control Software Rev.1.06 (PDF | English, 日本語) [Sample Code]
- RX Family, RL78 Family, 78K0R/Kx3-L Micron Technology M25P Series Serial Flash memory Control Software Rev.1.06 (PDF | English, 日本語) [Sample Code]
Temperature
WDT
Hardware Tools
In the Hardware Tools section, we provide links to the MCU starter kits. The starter kit is a fully self-contained hardware and software tool for evaluating microcontroller features and performance and can be used to start development. It includes the Renesas E1 on-chip debugger, access to all I/O pins and serial interfaces such as RS-232, LIN, and CAN. The starter kit is the fastest way to get the hardware and software needed to begin development right away. We provide links to the user's manual and quick start guide as well as a link to purchase.
Starter Kits
Starter Kit | Description | Featured Documents | Ordering |
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Y-ASK-RL78F15 |
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Buy |
Programming Tools
We also offer a newer and faster emulator for separate purchase. While there is a debugger included in the starter kit, we offer the option here to purchase the newer and faster E2 emulator/debugger for programming and debugging RL78/F1x devices.
In addition to a hardware emulator/debugger, we also offer the Renesas Flash Programmer for free download. The Flash programmer contains a simple-to-use graphical user interface which is ideal for first-time developers.
Programming Tools | Description | Featured Documents | Ordering |
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E2 Emulator | On-chip debugging emulator for RH850 family and RL78 family. Also available as a flash memory programmer. | ![]() |
Contact Us |
Renesas Flash Programmer (Programming GUI) |
The Renesas Flash Programmer provides usable and functional support for programming the on-chip flash memory of Renesas microcontrollers in each phase of development and mass production.
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Free Download |
Software Tools
In the Software Tools section, we have many resources to assist with your MCU project.
For your compiler toolchain needs, we recommend IAR Systems. We provide a link to the partner site which allows you to start your design without delay.
In addition, we offer software libraries, and driver generation software called Applilet3. It's available for free download, and it provides support in generating device drivers for peripheral modules. The software and user manuals for Applilet3 are provided for your convenience.
Compiler Toolchain
Company | Company Logo | Description |
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IAR Systems |
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IAR Embedded Workbench provides extensive support for RL78 devices. IAR Embedded Workbench is a complete set of development tools with leading optimization technology for creating powerful automotive applications. |
Software Libraries
The Flash Libraries are provided to easily rewrite the RL78 code and the data flash memory. The Flash Self-programming Library (FSL) can be used to rewrite the code flash. The Data Flash Access Library (FDL) allows simple access to the data flash. By the use of the EEPROM Emulation Library (EEL) the data flash performs in an EEPROM-like manner. The EEL also contains the FDL.
Software Library | Featured Documents | Download |
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Flash Self-programming Library Type T01, European Release | ![]() |
archive Software |
Data Flash Access Library Type T04 (Pico), European Release | ![]() |
archive Software |
EEPROM Emulation Library Type T02 (Tiny), European Release | ![]() |
archive Software |
Software Tools
Software | Featured Documents | Download |
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Applilet3 Code Generator | ![]() |
archive Software |
E-Learning
In this section, we provide links to instructional videos, workshops, and other introductory materials.
- RL78/F1x Workshop v2.00 as ZIP (ZIP)
- RL78/F1x Tools v2.00 (PDF)
Support
In case you still can't find what you're looking for, we provide links to Frequently Asked Questions and Forums as well as support links to send an inquiry to a Renesas expert about our RL78/F1x products.

RenesasRulz Forum
Browse material, post questions and join moderated discussions related to Renesas products.