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Small footprint MCUs with on-chip CAN modules

Renesas has introduced RX631 micro-controllers in 48- and 64-pin packages. Some of them provide on-chip CAN modules. They come with 256-KiB to 512-KiB flash memory and are designed to serve space-constrained applications. The chips will be available end of 2012.

THE LAUNCHED MCU'S ARE PIN-TO-PIN AND software compatible with other RX631 components. They address industrial, consumer, and medical application. “We are seeing increased demand for solutions that will enable people to interact with their electronics devices more efficiently and conveniently whether at home or at work,” said Bernd Westhoff from Renesas Electronics Europe. “By combining the high performance 165 DMIPS at 100-MHz operation of RX with built-in anti-temper feature and CAN connectivity in a small, inexpensive package, we can enable RX631 MCUs for a whole new range of industrial applications.”
The 32-bit RX central processing unit uses an enhanced Harvard architecture with separate instruction and operand busses going to both flash memory and SRAM. This enables simultaneous instruction fetch and memory writes, which boosts performance. Instructions are fed into the CPU from 100-MHz flash memory and are processed by a 5-stage execution pipeline enabling single-clock operations. The CPU also integrates a single-precision 32-bit floating-point unit, which performs complex non-linear math in fewer clock cycles. The multiply accumulate unit enables efficient digital signal processing. The RX register set consists of nine control registers, sixteen 32-bit general-purpose registers, and a 48-bit accumulator register. There is a memory protection unit. The interrupt control unit enables ultra fast 5-cycle interrupt latency.
The launched MCUs are equipped with one CAN and USB channel. The products are offered with a rich set of communication, timer and analog peripherals including up to 12 A/D channels, one 10-bit D/A converter, and a real-time clock (RTC). In a 64-pin LQFP package, the RX631 provides a number of timers. It also features serial communication channels including six SCI, two SPI, and one I2C. Four channels of DMA and a Data Transfer Controller improves transfers with peripherals and unburdens the CPU from managing peripherals.
Since the rollout of the MCU family in 2009, the Japanese chipmaker has introduced tools and software partnerships to support the micro-controllers. Third-party support for RTOS (real-time operating systems), middleware, and USB protocol stacks is available from the global community of Renesas Electronics' partner vendors. There are also several CANopen protocol stack providers supporting this MCU family.

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