RL78/F22

Features

Key Features
- RL78 core, Max. 40MHz
- 128KB Flash
- 12KB RAM
- 12-bit A/D converter
- Motor control: DC and BLDC - Field-oriented Control (FOC)
- Application accelerator unit
- Optimized DC/DC converter support
- Super-low power consumption
State-of-the-Art Interfaces
- LIN, UART, SPI, I²C, SENT
- Capacitive sensing unit (Max. 12ch)
- 16 x PWM output
Support for FuSa and Security
- Security module with EVITA-Light support
- ISO 26262 ASIL B
AUTOSAR MCAL
- QINeS-Lite (manufactured by FPT Automotive): AUTOSAR MCAL (ASIL B) support
Extensive ecosystem supporting the latest standards concerning tool, hardware, and software

Find Other Products in RL78 Low-Power 8 & 16-Bit MCUs

RL78/F22 Block Diagram

Description

The RL78/F22 next-generation super-low power automotive microcontrollers are ideal for realizing future highly reliable smart actuators and sensors, as well as low-end body electronic control units (ECUs). As an innovative prolongation of the known RL78/F1x MCUs, the RL78/F22 can cover prospective market requirements. With its increased CPU performance, high-temperature capability, and enhanced peripheral feature set, the RL78/F22 is a perfect fit for various applications.

RL78/F2x products are designed according to ISO 26262 and support functional safety (FuSa) up to ASIL B. Additionally, partner-provided AUTOSAR MCAL (ASIL B) is also available. RL78/F2x products support up to the EVITA-Light security standard or more. An AES crypto module can handle key lengths of up to 256 bits and supports secure boot and authentication. To further boost the calculation performance for BLDC field-oriented control (FOC) motor control and DC/DC control systems, RL78/F2x is equipped with the unique application accelerator IP to offload complex trigonometric and arithmetic processing. RL78/F22 is equipped with a capacitive touch sensing unit (CTSU2SLa).

RL78/F2x MCUs are fully hardware and software upward-compatible with RL78/F1x, enabling software reuse.

Parameters

Attributes	Value
Program Memory (KB)	128
Data Flash (KB)	8
RAM (KB)	12
Carrier Type	Full Carton (Tray), Full Tray (Tray), Tape & Reel
Supply Voltage (V)	1.8 - 5.5
I/O Ports	15, 23, 36
Temp. Range (°C)	Ta = -40 to +105, Ta = -40 to +125
Operating Freq (Max) (MHz)	40
USB FS (host ch/device ch)	( 0 / 0 )
SCI or UART (ch)	2, 3, 4
SPI (ch)	2, 3, 4
I2C (#)	2, 3, 4
CAN (ch)	0
CAN-FD (ch)	0
Wireless	No
LIN (#)	1
16-Bit Timer (ch) (#)	15
12-Bit A/D Converter (ch)	4, 8, 17
10-Bit A/D Converter (ch)	0
24-Bit Sigma-Delta A/D Converter (ch)	0
12-Bit D/A Converter (ch)	0
10-Bit D/A Converter (ch) (#)	0
8-Bit D/A Converter (ch)	0
Capacitive Touch Sensing Unit (ch)	7, 10, 12
Segment LCD Controller	No
Security & Encryption	Secure Boot, AES, TRNG

Package Options

Pkg. Type	Pkg. Dimensions (mm)	Lead Count (#)	Pitch (mm)
HWQFN	4 x 4 x 0.8	24	0.5
HWQFN	5 x 5 x 0.8	32	0.5
LFQFP	7 x 7 x 1.6	48	0.5

Product Comparison

	RL78/F22	RL78/F13	RL78/F23
Operating Freq (Max) (MHz)	40	24, 32	40
Program Memory (KB)	128	64, 96, 128	128
RAM (KB)	12	4, 6, 8	12
Capacitive Touch Sensing Unit (ch)	7, 10, 12	0	0

Applications

Smart actuators
Sensors ECUs
Low-end body

Part Number	Status	Samples	Stock	Package	Budgetary Price (USD)	Carrier Type	Family Name	Series Name	Group Name	CPU Architecture	Main CPU	Sub CPU	Floating Point Unit	Bit Length	Program Memory (KB)	Data Flash (KB)	RAM (KB)	ECC SRAM	Lead Count (#)	Pitch (mm)	Pkg. Dimensions (mm)	Number of Supply Voltage(s) (#)	Supply Voltage (V)	I/O Ports	DMAC or DTC	Power-On Reset	Watchdog Timer (ch)	External Memory Bus (bit)	DRAM I/F	3D GPU	Accelerator	Temp. Range (°C)	External Interrupt Pins (#)	LVD or PVD	Operating Freq (Max) (MHz)	Sub-clock (32.768 kHz)	On-chip Oscillator	Ethernet speed	USB FS (host ch/device ch)	USB HS (host ch/device ch)	USB SS (host ch/device ch)	PCI Express (generation and ch)	SCI or UART (ch)	SPI (ch)	I2C (#)	Wireless	IrDA	LIN (#)	High Resolution Output Timer	PWM Output (pin#)	16-Bit Timer (ch) (#)	Standby operable timer	Asynchronous General Purpose Timer / Interval Timer (ch)	RTC	12-Bit A/D Converter (ch)	Capacitive Touch Sensing Unit (ch)	Graphics LCD Controller	Camera I/F (Parallel)	Image Codec	2D Drawing Engine	Segment LCD Controller	Security & Encryption	Debug Interface	Moisture Sensitivity Level (MSL)
R7F122F7G3ANP-C#BA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.59	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122F7G3ANP-C#HA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.59	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122F7G3ANP-C#UA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.59	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122F7G4ANP-C#BA0	Active	Available	Out of Stock	HWQFN	1ku \| $1.71	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122F7G4ANP-C#HA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.71	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122F7G4ANP-C#UA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.71	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	24#	0.5mm	4 x 4 x 0.8	1#	1.8 - 5.5	15	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	7#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	2	2	2#	No	No	1#	No	16	15#	No	1	Yes	4	7	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG3ANP-C#BA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.63	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG3ANP-C#HA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.63	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG3ANP-C#UA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.63	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG4ANP-C#BA0	Active	Available	Out of Stock	HWQFN	1ku \| $1.75	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG4ANP-C#HA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.75	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FBG4ANP-C#UA0	Active	N/A	Out of Stock	HWQFN	1ku \| $1.75	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	32#	0.5mm	5 x 5 x 0.8	1#	1.8 - 5.5	23	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	8#	Yes	40MHz	No	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	3	3	3#	No	No	1#	No	16	15#	No	1	Yes	8	10	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG3AFB-C#BA0	Active	N/A	Out of Stock	LFQFP	1ku \| $1.72	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG3AFB-C#HA0	Active	N/A	Out of Stock	LFQFP	1ku \| $1.72	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG3AFB-C#UA0	Active	N/A	Out of Stock	LFQFP	1ku \| $1.72	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +105	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG4AFB-C#BA0	Active	Available	Out of Stock	LFQFP	1ku \| $1.83	Full Carton (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG4AFB-C#HA0	Active	N/A	Out of Stock	LFQFP	1ku \| $1.83	Tape & Reel	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3
R7F122FGG4AFB-C#UA0	Active	N/A	Out of Stock	LFQFP	1ku \| $1.83	Full Tray (Tray)	RL78	RL78/F2x	F22	RL78	RL78-S3	No	No	16	128KB	8KB	12KB	Yes	48#	0.5mm	7 x 7 x 1.6	1#	1.8 - 5.5	36	DTC	Yes	1	No	No	No	No	Ta = -40 to +125	12#	Yes	40MHz	Yes	Yes	No	( 0 / 0 )	( 0 / 0 )	( 0 / 0 )	No	4	4	4#	No	No	1#	No	16	15#	No	1	Yes	17	12	No	No	No	No	No	Secure Boot, AES, TRNG	Single wire serial	3

Filters

Application Note
Capacitive Touch Sensor Microcontrollers Overview of CTSU Functional Safety Self Test
PDF 6.87 MB R11AN0512EJ0200 Rev.2.00 日本語 May 27, 2026
Functional safety functions are becoming an important on system design as automatic electronic control systems continue to expand to a wide range of applications. This APN describes the software for capacitive touch sensor(CTSU) functional safety self test.
Brochure
RL78 Automotive MCU Scout
PDF 2.19 MB R70PF0027ED1900 Rev.19.00 May 19, 2026
Application Note
Capacitive Sensor MCU QE for Capacitive Touch Advanced Mode Parameter Guide
PDF 3.46 MB R30AN0428EJ0330 Rev.3.30 日本語简体中文 Mar 24, 2026
This application note describes parameter tuning methods using QE for Capacitive Touch for microcontrollers that incorporate a Capacitive Touch Sensing Unit (CTSU). In addition to the default auto-tuning process, it provides an overview of the Advanced mode and adjustable CTSU parameters for optimizing touch performance.
Application Note
RL78 Family TOUCH Module Software Integration System Rev.2.30
PDF 956 KB R11AN0485EJ0230 Rev.2.30 日本語 Mar 24, 2026
AI-generated Summary: The TOUCH Module integrates capacitive touch detection using the CTSU hardware, supporting buttons, sliders, and wheels with configurable settings via QE for Capacitive Touch. It processes periodic capacitance measurements to determine touch states, employing baseline calibration, drift correction, hysteresis, and debouncing to ensure accurate touch detection and reduce noise. The module supports both self-capacitance and mutual-capacitance buttons, with majority judgment modes for reliable input. It provides APIs for initialization, scanning, data retrieval, sensitivity adjustment, and drift control, enabling flexible integration into RL78 microcontroller applications.
Related Files:
Sample Code
Application Note
RL78 Family CTSU Module Software Integration System Rev.2.30
PDF 1.58 MB R11AN0484EJ0230 Rev.2.30 日本語 Mar 24, 2026
AI-generated Summary: The CTSU module integrates capacitive touch sensing functions for RL78 microcontrollers, supporting multiple peripheral types with distinct features. It enables various measurement modes such as self-capacitance, mutual capacitance, and current measurement, with advanced functions including sensor correction, initial offset adjustment, multi-frequency measurements, shield functionality, and automatic judgment. Measurements can be triggered by software or external events, with results obtained via APIs. The module also supports diagnosis, moving average filtering, and temperature correction. Multi-clock measurements reduce noise, and calibration functions ensure accurate sensor readings. The document details API usage, hardware/software requirements, and operational modes, providing comprehensive guidance for integrating capacitive touch sensing in embedded systems.
Related Files:
Sample Code
Application Note
Capacitive Sensor Microcontrollers CTSU Capacitive Touch Introduction Guide
PDF 2.42 MB R30AN0424EJ0160 Rev.1.60 日本語简体中文 Dec 23, 2025
AI-generated Summary: Capacitive touch sensor microcontrollers utilize Renesas' Capacitive Touch Sensing Unit (CTSU) technology embedded in RX, RA, RL78 families, and Renesas Synergy™. The document explains capacitance detection principles, including self-capacitance and mutual-capacitance methods, and details the evolution from first-generation sensors to advanced CTSU2. It covers MCU lineups, hardware design guidelines, software configuration, tuning procedures, development environments, and evaluation kits to support capacitive touch product development. The CTSU converts capacitance changes into measurable signals, applying filtering and threshold judgment to detect touch inputs accurately.
Application Note
RL78 Family FFT Library: Deployment Guide Rev.1.10
PDF 1.08 MB R20AN0150EJ0110 Rev.1.10 日本語 Dec 22, 2025
Provides information for deploying FFT (Fast Fourier Transform) library.
Related Files:
Sample Code
Application Note
RL78 Family RL78 Digital Signal Controller Library - Filter Rev.2.06
PDF 1.83 MB R01AN1665EJ0206 Rev.2.06 日本語 Dec 22, 2025
Presents the specifications for a Digital Signal Controller (DSC) library function for the Renesas RL78, which includes generic specifications, detailed specifications for filter algorithm kernels, and guidelines for the DSC Library API.
Related Files:
Sample Code
Model - IBIS
IBIS Files for RL78/F22
Log in to Download ZIP 7.52 MB 20251222-rs-IBIS_RL78F22_V100 Dec 16, 2025
Product Reliability Report
R7F122FGGxAFB-C(x=3/4) Reliability Report for AEC-Q100
PDF 509 KB MCR-25-0425 Nov 06, 2025
Product Reliability Report
R7F122FBGxANP-C(x=3/4) Reliability Report for AEC-Q100
PDF 510 KB MCR-25-0424 Nov 06, 2025
Product Reliability Report
R7F122F7GxANP-C(x=3/4) Reliability Report for AEC-Q100
PDF 509 KB MCR-25-0423 Nov 06, 2025
Application Note
RL78 Family Board Support Package Module Using Software Integration System Rev.1.92
PDF 842 KB R01AN5522EJ0192 Rev.1.92 日本語 Oct 30, 2025
The Renesas board support package SIS module (r_bsp) forms the foundation of any project that uses Software Integration System (SIS) modules. The r_bsp is easily configurable and provides all the code needed to get the MCU and the board from reset to the main() function. This document describes r_bsp conventions and explains how to use it, configure it, and create a BSP for your own board.
Related Files:
Sample Code
Application Note
RL78/F22 Capacitive Touch Evaluation System Sample Code Rev.1.00
PDF 853 KB R01AN8072EJ0100 Rev.1.00 日本語 Oct 22, 2025
This document describes the contents of the sample code for the RL78/F22 Capacitive Touch Evaluation System.
Related Files:
Sample Code
Application Note
RL78/F22, F25 Safety Function Rev.1.00
PDF 815 KB R01AN7702EJ0100 Rev.1.00 日本語 Sep 30, 2025
This application note explains how to use the safety features implemented in the RL78/F22 and RL78/F25 microcontrollers (MCUs).It can be used to support functional safety in user systems and to detect faults in microcontrollers.

Datasheets (1)

Datasheet
RL78/F22, F25 Datasheet
PDF 2.53 MB R01DS0490EJ0120 Rev.1.20 Jun 30, 2025
RL78/F25 is equipped with 2 channels of CAN-FD function and is the first Renesas automotive microcontroller to feature capacitive touch functionality. This is the datasheet for the RL78/F22 and F25 products.

Manuals & Guides (2)

Manual - Hardware
RL78/F22, F25 User's Manual: Hardware
PDF 29.9 MB R01UH1061EJ0120 Rev.1.20 日本語 Jun 30, 2025
RL78/F25 is equipped with 2 channels of CAN-FD function and is the first Renesas automotive microcontroller to feature capacitive touch functionality. This is the user's Manual for the RL78/F22 and F25 products.
Manual - Hardware
RL78 Family User's Manual: Software Rev.2.30
PDF 1.3 MB R01US0015EJ0230 Rev.2.30 日本語 Apr 22, 2022

Application Notes & White Papers (27)

Application Note
Capacitive Touch Sensor Microcontrollers Overview of CTSU Functional Safety Self Test
PDF 6.87 MB R11AN0512EJ0200 Rev.2.00 日本語 May 27, 2026
Functional safety functions are becoming an important on system design as automatic electronic control systems continue to expand to a wide range of applications. This APN describes the software for capacitive touch sensor(CTSU) functional safety self test.
Application Note
Capacitive Sensor MCU QE for Capacitive Touch Advanced Mode Parameter Guide
PDF 3.46 MB R30AN0428EJ0330 Rev.3.30 日本語简体中文 Mar 24, 2026
This application note describes parameter tuning methods using QE for Capacitive Touch for microcontrollers that incorporate a Capacitive Touch Sensing Unit (CTSU). In addition to the default auto-tuning process, it provides an overview of the Advanced mode and adjustable CTSU parameters for optimizing touch performance.
Application Note
RL78 Family TOUCH Module Software Integration System Rev.2.30
PDF 956 KB R11AN0485EJ0230 Rev.2.30 日本語 Mar 24, 2026
AI-generated Summary: The TOUCH Module integrates capacitive touch detection using the CTSU hardware, supporting buttons, sliders, and wheels with configurable settings via QE for Capacitive Touch. It processes periodic capacitance measurements to determine touch states, employing baseline calibration, drift correction, hysteresis, and debouncing to ensure accurate touch detection and reduce noise. The module supports both self-capacitance and mutual-capacitance buttons, with majority judgment modes for reliable input. It provides APIs for initialization, scanning, data retrieval, sensitivity adjustment, and drift control, enabling flexible integration into RL78 microcontroller applications.
Related Files:
Sample Code
Application Note
RL78 Family CTSU Module Software Integration System Rev.2.30
PDF 1.58 MB R11AN0484EJ0230 Rev.2.30 日本語 Mar 24, 2026
AI-generated Summary: The CTSU module integrates capacitive touch sensing functions for RL78 microcontrollers, supporting multiple peripheral types with distinct features. It enables various measurement modes such as self-capacitance, mutual capacitance, and current measurement, with advanced functions including sensor correction, initial offset adjustment, multi-frequency measurements, shield functionality, and automatic judgment. Measurements can be triggered by software or external events, with results obtained via APIs. The module also supports diagnosis, moving average filtering, and temperature correction. Multi-clock measurements reduce noise, and calibration functions ensure accurate sensor readings. The document details API usage, hardware/software requirements, and operational modes, providing comprehensive guidance for integrating capacitive touch sensing in embedded systems.
Related Files:
Sample Code
Application Note
Capacitive Sensor Microcontrollers CTSU Capacitive Touch Introduction Guide
PDF 2.42 MB R30AN0424EJ0160 Rev.1.60 日本語简体中文 Dec 23, 2025
AI-generated Summary: Capacitive touch sensor microcontrollers utilize Renesas' Capacitive Touch Sensing Unit (CTSU) technology embedded in RX, RA, RL78 families, and Renesas Synergy™. The document explains capacitance detection principles, including self-capacitance and mutual-capacitance methods, and details the evolution from first-generation sensors to advanced CTSU2. It covers MCU lineups, hardware design guidelines, software configuration, tuning procedures, development environments, and evaluation kits to support capacitive touch product development. The CTSU converts capacitance changes into measurable signals, applying filtering and threshold judgment to detect touch inputs accurately.

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End Of Life Notice
End Of Life Notice [SAF-B-24-0011]
PDF 8.06 MB SAF-B-24-0011 日本語 Jun 12, 2024

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Product Reliability Report
R7F122FGGxAFB-C(x=3/4) Reliability Report for AEC-Q100
PDF 509 KB MCR-25-0425 Nov 06, 2025
Product Reliability Report
R7F122FBGxANP-C(x=3/4) Reliability Report for AEC-Q100
PDF 510 KB MCR-25-0424 Nov 06, 2025
Product Reliability Report
R7F122F7GxANP-C(x=3/4) Reliability Report for AEC-Q100
PDF 509 KB MCR-25-0423 Nov 06, 2025

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RL78 Automotive MCU Scout
PDF 2.19 MB R70PF0027ED1900 Rev.19.00 May 19, 2026

Renesas Boards & Kits

TB-RL78/F22

RL78/F22 (R7F122FGG) Target Board

As a CPU board usable in connection with the on-chip debugging emulators E2 and E2 Lite, the RL78/F22 (R7F122FGG) target board enables simple and easy evaluation of the RL78/F22 MCU.

Note: This board comes with two touch buttons for simple evaluation, but when designing an actual board, please... Read More

Capacitive Touch Evaluation System for RL78/F22

The RL78/F22 capacitive touch evaluation system (RSSK-RL78F22) makes it easy for users to evaluate touch solutions offered by Renesas. You can start evaluating immediately out of the box using the board and software included in each kit. This kit can evaluate self-capacitive button and slider... Read More

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Connectivity Module

CAN Bus J1939 Bridge (for Heavy-Duty)

Provides a high-performance communication bridge for heavy-duty commercial vehicles. Enables seamless data acquisition and translation from the Controller Area Network (CAN) J1939 protocol to telematics systems. Supports Fleet Management System (FMS) data standards to monitor vehicle diagnostics, fuel consumption, and environmental metrics. Designed to assist fleet operators in achieving ESG goals through precise carbon emission tracking and real-time vehicle status monitoring. The solution simplifies the integration of complex J1939 data into cloud-based management platforms.

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SwiSys Co., Ltd.

Support Communities

code on ram , error
Dear AZ-Renesas team I am running code that loads the program from code flash into RAM and executes it. However, after storing the code region in RAM, when I view the memory, the area shows the value 0xFF. When the uart log is displayed as shown below, the normal ...
Nov 5, 2025
- RL78 MCU
- Forum
about data flash write function
Hello AZ-Renesas team A shutdown suddenly occurred while writing on Data Flash.The write unit of data flash is 1 byte.Is there a way to check the data was written correctly?data flash does not seem to support ECC.Is 1byte a guaranteed unit that can be written ...
Feb 19, 2025
- RL78 MCU
- Forum
QE capacitive touch sensor setting
Hello, I am using the e² studio platform , RL78/F22 series MCU (R7F122FGG3AFB). After installing the e² studio application, the capacitive touch sensor enabling feature is not visible in the Smart Configurator. Kindly provide the installation or configuration guide to enable the capacitive touch sensor support. Thanks, and Regards,
Feb 12, 2026
- RL78 MCU
- Forum

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Knowledge Base

What is the difference between the RL78/F22's built-in touch function and the RL78/G23?
Last Updated: 11/12/2025 Question: What is the difference between the RL78/F22's built-in touch function and the RL78/G23? Answer: The capacitive sensor unit on the RL78/F22 adds a multi-electrode connection (MEC) and auto judgment function.MEC can connect ...
Nov 12, 2025
RL78 Family: How do you pick the right pull-up resistors for I²C communication?
... the peripheral enable register n (PERn), and then set it (1). Suitable Products RL78/F12, RL78/F13, RL78/F14, RL78/F15, RL78/F22, RL78/F23, RL78/F24, RL78/F25, RL78/G10, RL78/G11, RL78/G12, RL78/G13, RL78 ...
Dec 16, 2025
How to Enable Automatic Judgment with VMM for CTSU2SLa in RL78 Devices?
Last Updated: 05/21/2026 Overview Automatic judgment described in this article is a hardware feature available in CTSU2SLα (e.g., RL78/F25, RL78/F22). For other RL78 devices such as G22, G23, and L23, similar functionality can be achieved through software (SMS), but is not ...
May 21, 2026

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Partners

FPT Software Co., Ltd.

Founded in 2005, FPT Automotive employs nearly 5,000 engineers to advance SDV technology with a focus on safety and seamless integration. MaaZ-Lite is a streamlined and cost-effective version of MaaZ that supports standardized automotive software development with full AUTOSAR Classic compliance. FPT Automotive is a partner of SCSK supporting the global markets outside Japan.

SCSK Corporation

SCSK provides the QINeS-Lite software platform to maximize the performance and ensure stable operation of RL78/F24 and its sequel products. QINeS-Lite is developed based on 10 years of experience since SCSK launched its first AUTOSAR-compatible "QINeS-BSW" in Japan with the consideration of future market trends to meet the needs of the Japan market.

Murata Manufacturing Co., Ltd.

Temperature detection solution: Combine with an NTC thermistor for precise high-temperature monitoring.

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Next-Generation Actuator and Sensor Microcontroller with Capacitive Touch IP

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