Features
- CPU: RL78 core, Max. 24MHz
- Voltage: 1.9V to 5.5V
- Package: 80 to 100-pin QFP
- Memory: SRAM Max. 8KB, Program Flash Max. 128KB
Description
RL78/I1B microcontrollers adapt various electricity meter metrologies for different regulations by country and realize efficient power measurement by the combination of low active current 96uA/MHz, standby current 0.66uA (Halt mode with 32kHz oscillator and RTC backup on), 24-bit ΔΣA/D converter, phase adjustment circuits and high pass filter. CPU clock frequency can be minimized, taking advantage of the efficient power measurement features, which include the low power ΔΣ A/D converter 0.53mA/ch. RL78/I1B microcontrollers have a +/- 1% high-accuracy high-speed on-chip oscillator with +/-0.05% frequency correction function. The benefit of the accurate on-chip oscillator keeps the system robust even when the external oscillator is stopped.
Parameters
| Attributes | Value |
|---|---|
| Program Memory (KB) | 64, 128 |
| Data Flash (KB) | 0 |
| RAM (KB) | 6, 8 |
| Carrier Type | Full Carton (Tray), Full Tray (Tray), Tape & Reel |
| Supply Voltage (V) | 1.9 - 5.5 |
| I/O Ports | 53, 69 |
| Temp. Range (°C) | Ta = -40 to +85 |
| Operating Freq (Max) (MHz) | 24 |
| USB FS (host ch/device ch) | ( 0 / 0 ) |
| SCI or UART (ch) | 3 |
| SPI (ch) | 1 |
| I2C (#) | 3 |
| CAN (ch) | 0 |
| CAN-FD (ch) | 0 |
| Wireless | No |
| LIN (#) | 1 |
| 16-Bit Timer (ch) (#) | 8 |
| 12-Bit A/D Converter (ch) | 0 |
| 10-Bit A/D Converter (ch) | 4, 6 |
| 24-Bit Sigma-Delta A/D Converter (ch) | 3, 4 |
| 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) | 0 |
| Segment LCD Controller | Yes |
| Security & Encryption | No |
Application Block Diagrams
 | Three-Phase Smart Electric Meter Three-phase smart meter with remote data access and high-voltage operation for heavy loads. |
 | 1-Phase Static Meter Low-power 1-phase static meter optimized for basic electronic metering needs. |
 | Smart 1-Ph E-Meter Flexible energy metering system with wired and wireless communications, tamper detection, and isolation support. |
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Renesas Boards & Kits
RL78/I1B Target Board
The RTE510MPG0TGB00000R is a target board used for evaluating microcontroller operations using the E1, the Renesas Electronics on-chip debug emulator with programming function.
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- IDE and Coding ToolRenesas integrated development environment (IDE) [Support MCU/MPU: RH850, V850, RX, RL78, 78K0R, 78K0] (Note: CS+ is not generally promoted to U.S. and European customers.) (Note: To use Smart Configurator on CS+ for RL78/G23 and RX family MCUs, install the Smart Configurator for each MCU family separately downloading from ”Design & Support” > ”Development Tools” > ”Smart Configurator”)
- IDE and Coding ToolEclipse-based Renesas integrated development environment (IDE).
- IDE and Coding ToolIAR 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.Provider: IAR Systems
- IDE and Coding ToolRenesas IAR Embedded Workbench Device-Support-Packages include all device-specific files to be used with the Embedded Workbench IDE.
- Compiler/AssemblerC Compiler Package for RL78 Family [IDE: CS+, e² studio]
- Compiler/AssemblerC Compiler Package for the RL78 and 78K Families [IDE: CS+]
- Solution ToolkitDevelopment assistance tool helps to shorten the times taken in operations for the tuning of currents drawn. [Standard item in the "e² studio" and CS+ (CS+ for CC only) IDEs] [Support MCU/MPU: RX, RL78]
- Solution ToolkitRound-trip workflow for AI development and performance validation allowing to collect data, optimize models, and deploy directly to Renesas hardware
- EmulatorOn-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RH850, RL78, RX, V850, 78K0R, 78K0, R8C]
- EmulatorOn-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RH850, R-Car D1, RL78, RX, RISC-V MCU]
- EmulatorOn-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RL78, RX, RISC-V MCU]
- EmulatorOn-chip debugging emulator. Also available as a flash memory programmer. For RX600 or RX700 Series MCU, trace functions and Real-time RAM monitor functions available. For MCUs other than RX600 or RX700, the available debugging function corresponds to that of E2 Emulator Lite. [Support MCU/MPU: RX, RL78, RH850, V850, 78K0R, 78K0, R8C]
- EmulatorFull-spec emulator for RL78 MCUs. High-performance debugging functions such as time measurement, coverage, and trace. In addition, a self-testing function detects faults in the IECUBE and performs maintenance.
- Programmer (Unit/SW)On-chip debugging emulator available as a flash memory programmer [Available flash programming software: Renesas Flash Programmer or Flash Development Toolkit] [Support MCU/MPU and devices: RX, RL78, RH850, V850, 78K0R, 78K0, R8C, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver]
- Programmer (Unit/SW)On-chip debugging emulator available as a flash memory programmer [Available flash programming software: Renesas Flash Programmer] [Support MCU/MPU and devices: RE, RX, RL78, RH850, RISC-V MCU, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver]
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- IDE and Coding ToolRenesas integrated development environment (IDE) [Support MCU/MPU: RH850, V850, RX, RL78, 78K0R, 78K0] (Note: CS+ is not generally promoted to U.S. and European customers.) (Note: To use Smart Configurator on CS+ for RL78/G23 and RX family MCUs, install the Smart Configurator for each MCU family separately downloading from ”Design & Support” > ”Development Tools” > ”Smart Configurator”)
- IDE and Coding ToolEclipse-based Renesas integrated development environment (IDE).
- IDE and Coding ToolIAR 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.Provider: IAR Systems
- IDE and Coding ToolRenesas IAR Embedded Workbench Device-Support-Packages include all device-specific files to be used with the Embedded Workbench IDE.
- Compiler/AssemblerC Compiler Package for RL78 Family [IDE: CS+, e² studio]View More (32)
Software & Tools (32)
- Sample CodeProvides information for deploying FFT (Fast Fourier Transform) library.
- Sample CodePresents 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.
- View More (27)
Sample Code (27)
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Development ToolUniversal third-party programmers support a wide range of Renesas programmable devices across both off-board and on-board programming modes.Provided By: Elnec s.r.o.- Development ToolProvides high-volume automated programming systems engineered for factory-scale production, enabling efficient handling of a wide range of integrated circuit (IC) devices. Optimized for microcontrollers (MCUs) and flash memory, the systems support tube, tape, and tray input/output configurations for flexible manufacturing integration. Advanced auto-teach alignment capabilities ...Provided By: DediProg Technology Co., Ltd.
- Development ToolThe AH-480 automated programming system is built around a patented rotary robotic arm equipped with dual-sided vacuum nozzles, enabling high-speed, high-precision IC pick-and-place operations. The system integrates 16 units of the latest LEAP universal programmers to deliver stable, high-throughput programming performance. Designed for ...Provided By: LEAP ELECTRONIC CO., LTD.
- Development ToolProvides universal device programming systems combining algorithms, process-control software, and socket modules for Renesas microcontroller production. Enables high-volume programming across the RA, RX, RL78, RH850, RZ, R8C, V850, M16C, H8, H8SX, H8S, SH, 78K and Synergy families using 9th- and 10th-generation universal site technology. Supports new socket ...Provided By: BPM Microsystems
- Development ToolBSMART delivers a versatile, portable interfacing solution for seamless operation on silicon devices anytime and anywhere. Its compact, pocket-sized design supports both laboratory and on-site interventions. Managed via Ethernet LAN, USB-UART, or Bluetooth® through the BSMART App, it interfaces with microprocessors and serial memories using standard ...Provided By: SMH Technologies S.r.l.View More (44)
Partner Solutions (44)
Support Communities
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RL78 I1B R5F10MMG , Required data flash and store 15 byte in this data flash memory
Dear Sir, i am using the R5F10MMG MCU in our project and development almost done, we required in end time of project data flash memory for save the 15 bytes in this data flash memory. Please guide me and help for this issues. Thanks & Regards Shivali Singh
Sep 2, 2021 -
executing Halt instruction from RAM
hello everyone, i was trying to implement fast CRC in my RL78/I1B module. For that i purpose i was studying its datasheet and it states that in order to calculate CRC i have to execute HALT and RET instruction from RAm and don't know how to do ...
May 7, 2018 -
RL78
Hi friends, I am working on (RL78/I1B - R510MMGD) Controller. I am facing problem on Internal RTC. Can u suggest me to solve this Problem? Initially, i set (i.e : mark -> set initial time and date) the RTC date and RTC time on Code generator. Then i Checked without ...
Oct 8, 2014
Knowledge Base
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RL78 Family: Is it possible to initialize the on-chip debug security ID?
... G1H, RL78/G1M, RL78/G1N, RL78/G1P, RL78/G22, RL78/G23, RL78/G24, RL78/H1D, RL78/I1A, RL78/I1B, RL78/I1C, RL78/I1D, RL78/I1E, RL78/L12, RL78/L13, RL78/L1A, RL78/L1C Japanese
Aug 1, 2025 -
RL78 Family: Relationship between A/D Conversion Resolution and A/D Conversion Time
... ✓ (Note) ✓ ✓ Different B ✓ ✓ ✓ Same C ✓ ✓ Different D ✓ N/E E ✓ ✓ Different Group A: RL78/I1B, RL78/I1C, RL78/I1EGroup B: RL78/G23, RL78/G24Group C: RL78/G1A, RL78/G1P, RL78/ ...
Nov 12, 2024 -
RL78 Family: Why can't the maximum transfer rate be used in master mode with Simplified SPI (CSI) in Smart Configurator?
Please refer to the "Electrical Characteristics" section in the user’s manual. The transfer rate for Simplified SPI (CSI) communication depends on the operating voltage range. For example, in the RL78/G23, when HS mode is selected and EVDD is set between 1.8V and 5.5V, the transfer ...
Sep 22, 2025
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