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CANopen protocol stack targets Renesas 32bit MCUs

26 Oct 2015

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Renesas Electronics Europe and port GmbH have brought to market what they describe as a highly efficient CANopen protocol stack for Renesas' smart 32bit RX231 MCUs. The Renesas RX231 series offers a family of devices with large on-chip SRAM of up to 64KB and up to 512KB of on-chip flash, paired with one CAN interface, which is fully compliant with the CAN 2.0B and the ISO11898-1 (standard and extended frames) standards, and is aimed at industrial and consumer applications requiring CAN interfaces.

Renesas RX231 series

The embedded CAN module on the RX231 includes 20 buffers, 16 of which can be programmed to be shared between receive and transmit functions, creating two receive FIFO's and a transmit FIFO. A powerful acceptance filter selects which messages to receive according to 16 receive rules allowing the user a great deal of flexibility in creating incoming message handling strategies. The CAN modules can interact with Renesas' RX CPU by using different interrupts such as reception complete, transmission complete, receive FIFO, transmit FIFO and error interrupts.

The CANopen stack follows the strict and very efficient coding and documentation standards established by port GmbH. These standards result in a very small memory footprint (less than 19KB Flash/3KB RAM) as well as a high execution speed and easily readable code, stated the company. For easy implementation, port offers board support packages for the standard Renesas Starter Kits.

The RX231 MCU group with embedded CAN comes in 48-pin to 100-pin packages with on-chip flash memory of 128KB to 512KB and 32KB to 64KB of on-chip SRAM.

The RX231 MCU group offers a maximum operating frequency of 54MHz. As part of the enhanced RXv2 CPU core architecture, the RX231 incorporates an on-chip 32bit multiplier, single-precision floating-point unit (FPU) and a 32bit enhanced barrel shifter.

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