Skip to main content

Renesas Electronics Announces New Ultimate-Low-Power RL78 Microcontrollers with Built-in LCD Controller

0.6 µA (Note 1) Current Consumption with Full Calendar Function and Support for Up to 280 LCD segments Make RL78/L12 MCUs Ideal for Battery-Operated Devices

TOKYO, February 27, 2012 — Renesas Electronics Corporation (TSE: 6723), a premier supplier of advanced semiconductor solutions, today announced the RL78/L12 Group of ultimate-low-power microcontrollers (MCUs) with on-chip liquid crystal display (LCD) controller that reduce current consumption by approximately 30 percent compared to earlier Renesas products (Note 2). The new 16-bit MCUs are designed for products equipped with small LCD panels, including portable household appliances, healthcare devices, building management systems, and industrial applications, that require improved user interfaces and ultimate low power.

To enable the design of improved power-efficient systems that incorporate enhanced human-machine interfaces, Renesas developed the ultimate low-power RL78/L12 Group of MCUs. The new MCUs combine proven LCD control technology from Renesas with the low power consumption and high performance of the RL78 Family of 16-bit MCUs. The new line-up complements Renesas' family of non-LCD RL78 devices, providing designers an expanded platform to innovate and leverage development investments. The RL78/L12 Group consists of 18 product versions with pin count ranging from 32- to 64-pins, and on-chip flash memory capacities ranging from 8 kilobytes (KB) to 32 KB. This new line continues Renesas' commitment to enabling a smart society by delivering power-efficient solutions for a range of portable applications.

Key features of the new RL78/L12 Group of MCUs:

  • (1) Power consumption among the lowest in the industry

    The RL78/L12 devices take advantage of the ultimate-low-power technology associated with the RL78 Family. The new devices consume as little as 66 µA/MHz and can achieve a mere 0.57 µA while operating the real-time clock with full calendar function, low voltage detection circuit and maintaining 100 percent of RAM contents. In addition, the RL78/L12 MCUs feature a mode that halts the internal LCD-related operations of the MCU when the multi-segment LCD display is not in use, further reducing current consumption and boosting power efficiency.
  • (2) Expanded LCD segment count

    The 64-pin version of the new line-up supports up to 280 LCD segments (Note 3), increasing the amount of information that can be displayed.
  • (3) Advanced LCD controller/driver

    The new RL78/L12 Group supports up to 280 LCD segments in its 35×8 configuration and can operate from 1.6 V to 5.5 V power supply. The LCD controller provides three methods of generating LCD drive voltage—internal voltage boost, capacitor split, and external resistance division (Note 4)—all designed for reduced overall system power consumption. Compared with earlier Renesas products, the current consumption of the internal voltage boost method is approximately 35 percent lower. The capacitor split method is approximately 47 percent lower power, while the external resistance division method is approximately 30 percent lower. For products using battery drive, the internal voltage boost method in particular can make an important contribution to the battery life of the overall system.

Exhibition at Embedded World 2012

Renesas' RL78/L12 MCUs will be showcased at Embedded World 2012, to be held in Nuremberg, Germany from February 28 to March 1, 2012.

  • (Note 1) Target value of current consumption (typ.) when LCD and RTC are running at subsystem clock operation mode, HALT mode and ultra-low power consumption oscillation mode.
  • (Note 2) Comparison of current consumption during LCD display in sub-system clock operation halt mode with the 78K0R/Lx3, an earlier Renesas MCU product.
  • (Note 3) Total number of segments for the 64-pin package product version, during operation with 8 common × 35 segment lines.
  • (Note 4) The internal voltage boost method makes it possible to maintain the contrast of the LCD display regardless of the power supply voltage, making it suitable for systems employing battery drive. The customer does not need to provide a dedicated LCD power supply on the board because the LCD drive voltage is generated from the MCU's power supply by an on-chip voltage boost circuit. The capacitor split method provides the lowest current consumption characteristics of the three. The external resistance division method provides powerful drive capability for LCD waveforms and is suitable for use with large LCD panels.

Refer to the separate sheet for the main specifications of the new RL78/L12 Group of MCUs.

Pricing and Availability

Renesas' new RL78/L12 Group of MCUs will be available in June 2012 in initial sample quantities. Mass production is scheduled to begin in August 2012 and is expected to reach a volume of 2,000,000 units per month in August 2013. The sample price for the new products will differ depending on the memory capacity, package type and pin count. For example, samples of the R5F10RLCAFB device with 32 KB of on-chip flash memory, 1.5 KB of on-chip RAM and a 64-pin low-profile quad flat package (LQFP) will be priced at US$2.0 per unit. (Pricing and availability are subject to change without notice.)

About Renesas Electronics Corporation

Renesas Electronics Corporation (TSE: 6723), the world's number one supplier of microcontrollers, is a premier supplier of advanced semiconductor solutions including microcontrollers, SoC solutions and a broad range of analog and power devices. Business operations began as Renesas Electronics in April 2010 through the integration of NEC Electronics Corporation (TSE:6723) and Renesas Technology Corp., with operations spanning research, development, design and manufacturing for a wide range of applications. Headquartered in Japan, Renesas Electronics has subsidiaries in approximately 20 countries worldwide. More information can be found at www.renesas.com.

(Remarks) The new RL78 Family uses SuperFlash® technology licensed from Silicon Storage Technology, Inc. SuperFlash® is a registered trademark of Silicon Storage Technology, Inc., of the U.S.A. in the United States, Japan, and other countries. Names of products or services mentioned in this release are the trademarks or registered trademarks of their respective owners.


The content in the press release, including, but not limited to, product prices and specifications, is based on the information as of the date indicated on the document, but may be subject to change without prior notice.

Related Content

Investor Relations
Stock Price

End of content

Back To Top