The new RL78 MCUs achieve the industry-leading low power consumption, with operating current of only 70 microamperes (μA)/megahertz (MHz) and standby current of 0.7 µA with the real-time clock (RTC) and low-voltage detection (LVD) functions active. The new family’s power-efficient design, based on a 130-nanometer (nm) process node, can deliver 41 Dhrystone (Note 1) million instructions per second (DMIPS) when operating at 32 MHz. The new RL78 MCUs’ advanced process technology enables higher integration of on-chip components such as a 32MHz +/-1 percent on-chip oscillator (Note 2), data flash with background operation supporting up to 1 million re-write cycles (Note 2), and 1.6 to 5.5 volts (V) operation. These features provide greater functionality while reducing overall system cost, which are vital requirements for the next generation 8-bit designs.
”The new RL78 MCU family is designed to meet the market needs by providing the latest in low power technology, and feature-rich integration geared for 8-bit applications,” said Shigeo Mizugaki, Senior Vice President, Renesas Electronics Corporation. “The great acceptance of the R8C and 78K families across multiple markets over the last few years is true evidence of Renesas Electronics’ commitment to the embedded community. The RL78 family not only combines key attributes from both of these families to offer the best migration path to current Renesas Electronics’ users, but it also introduces state-of-the-art features which enable the design of more innovative products. The new family’s native low power technology, high-component integration and extensive built-in safety mechanisms make them ideal for a number of applications including battery-operated devices and household appliances.”
The RL78 family will be comprised of both general purpose and application-specific standard MCUs. The general purpose “G” series will include a total of 302 products in the RL78/G12 Group and RL78/G13 Group. The initial products will offer extensive scalability with 2KB to 512KB of program space and with package options ranging from 20- to 128-pins.
Renesas Electronics was formed on April 1 through the merger of NEC Electronics Corporation and Renesas Technology Corp. Since then the company has boosted product development efficiency by adopting (integrated) platforms as the basis of design work in its key MCU business. The number of processes used is also being reduced from six to three as the company builds a fab network that will help reduce production costs and strengthen its ability to respond to shifting demand trends.
The RL78 MCUs are the first family of MCUs to be developed using an integrated platform following the merger and to employ the new 130 nm process. The RL78 Family combines and extends technology from the earlier R8C and 78K 8-bit and 16-bit MCUs from the two merged companies, contributes to lower overall system power consumption, provides an extensive variety of different product versions, and will help developers reduce overall system costs. The RL78 Family was developed to meet the future requirements of the 8-bit and 16-bit MCU market for the foreseeable future.
Other key features of the new RL78 Family Include:
1) Functions that contribute to reduced system power consumption overall
In addition to its 70uA/MHz current consumption in active mode, and 0.7uA with RTC + LVD active, the RL78 MCUs support a new low-power mode called “Snooze Mode”. This mode supports A/D conversion and serial communication while the CPU is in standby mode, which can significantly extend the life of battery-operated devices.
2) Built-in safety mechanisms
The RL78 MCUs incorporate a number of built-in mechanisms that can be utilized to comply with standard safety regulations (such as IEC60730) which are required for electrical appliances. Such features include a flash memory cyclic redundancy check (CRC) function, RAM parity error checking, clock fail and frequency detection circuit, A/D test function and illegal memory access detection.
3) Industry-standard development tools
Available hardware development tools include Renesas Electronics’ low-cost E1 on-chip debugging emulator and the IECUBE full-spec emulator, which provide customers with the ability to choose the MCU product that best matches their debugging requirements. Plans call for the release of versions of the E1 emulator for all Renesas Electronics’ MCUs in addition to the RL78 Family, providing broad support for Renesas Electronics products at low cost.
Powerful support for developers of application software is provided by Renesas Electronics’ CubeSuite integrated development environment (IDE), and the PG-FP5 flash memory programmer. In addition, Renesas Electronics partner companies are expected to release a wide variety of hardware and software development tools for the RL78 Family.
Note 1) Dhrystone is a program used to evaluate the operation performance of computers. The performance value of 41 DMIPS for the RL78 Family was measured using the Dhrystone 2.1 standard.
Note 2) Target values.