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Low-power MCUs with on-chip CAN modules

The V850E2/Fx4-L series with 19 new 32-bit micro-controllers (MCUs) by Renesas (Japan) are designed for the automotive comfort and body segment. The low-power MCUs with up to two CAN ports offer scalability and compatibility combined with sophisticated peripheral functions to be applicable for roof or window lifters, door-, seat- and light modules, HVAC (heating, ventilation, and air conditioning) and body control modules. The chipmaker provides as a premium member Autosar support.

THE INTRODUCTED MCU SERIES FEATURES a current consumption in active mode of less than 0,35 milliamps mA at 1 MHz. The chips 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. The CAN modules supporting 11-bit and 29-bit CAN-IDs provide 32 message registers. Using the ISO 11898-6 selective wake-up CAN transceivers, may lead to additional power savings. A further feature is the LIN-master controller (LMA), which supports the automatic LIN-frame detection without CPU interactivity. The MCUs combine and extend the legacy technologies of the two merged companies, NEC and Renesas: the 32-bit Risc CPU and the power-saving Monos (metal oxide nitride oxide silicon) flash-memory technology employing a 90-nm process.

The products 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 MCUs address this demand by providing flash memory ranges from 256 KiB up to 1,5 MiB. They come in packages with pin-counts ranging from 64 to 176. An enhanced peripheral set is implemented, including PWM generation as well as eight DMA (direct memory access) channels.

The verified Autosar MCAL (micro-controller abstraction layer) software drivers can be obtained as a stand-alone software package or integrated in a complete software stack in cooperation with partner companies. MCAL is a software module that directly accesses on-chip MCU peripheral modules and external components that are mapped to memory, and makes the upper software layer independent of the micro-controller (see figure). To comply with the Autosar requirements, the system protection functionality (SPF) has been implemented. The SPF includes a memory protection unit (MPU) and a system register protection (SRP).

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