Renesas Electronics has developed the
V850E2/Fx4-L series which now features 19 new 32-bit microcontrollers
(MCUs). Designed for the automotive comfort and body segment, the
low-power MCUs offer scalability and compatibility combined with
sophisticated peripheral functions to provide premium automotive body
solutions for applications such as roof or window lifters, door-, seat-
and light modules, HVAC (heating, ventilation, and air conditioning) and
body control modules.
The latest V850-based MCU series enables low current consumption in active mode of less than 0.35 mA at 1 MHz.
The V850E2/Fx4-L MCUs provide a power-saving feature called the
sequencer (SEQ). The SEQ supports hardware monitoring of digital inputs
in deep stop mode without any usage of the CPU or memory. When the SEQ
detects activities at the digital inputs, the device switches from deep
stop mode to run mode. A further feature is the LIN-master controller
(LMA) which supports the automatic LIN-frame detection without CPU
The low-power V850E2/Fx4-L MCUs combine and extend the legacy
technologies of the two merged companies, NEC Electronics and Renesas
Technology: the V850 32-bit RISC CPU and the power-saving MONOS (metal
oxide nitride oxide silicon) flash technology employing 90-nanometer
(nm) process technology of the RX and SH MCU Families.
The V850E2/Fx4-L MCUs incorporate a maximum CPU clock from 48 MHz up to
64 MHz with a performance of 1.81 Dhrystone MIPS (DMIPS)/MHz. With the
adoption of AUTOSAR and increased system functionality, there is growing
demand for larger memory capacity. The V850E2/Fx4-L MCUs address this
demand by providing flash memory ranges from 256 KB up to 1.5 MB
equipped in packages with pin counts ranging from 64 to 176. An enhanced
peripheral set is implemented, including PWM generation, up to two CAN
interfaces as well as 8 DMA (direct memory access) channels.
Fully-verified AUTOSAR MCAL (microcontroller abstraction layer) software
drivers are scheduled to be prepared. Renesas' MCAL software drivers
can be obtained as a stand-alone software package or integrated in a
complete basic software stack in cooperation with partner companies. To
comply with the AUTOSAR requirements, new system protection
functionality (SPF) has been implemented in all V850E2/Fx4-L devices.
The SPF includes a memory protection unit (MPU) and a system register
Samples of Renesas' V850E2/Fx4-L MCUs are available now. Mass production
is scheduled to begin in the beginning of CY2013 and is expected to
reach a volume of 1,500,000 units per month in December 2013.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.