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FSA rolls out 32bit RISC MCUs with ARM Cortex-M4 core

Posted: 14 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Fujitsu Semiconductor America? MCU? RISC? Cortex-M4? SRAM?

Fujitsu Semiconductor America (FSA) recently rolled out its new FM4 family of 32bit RISC microcontrollers based on the ARM Cortex-M4 processor core. The MCUs are designed for applications that require advanced, high-speed computing performance, such as general-purpose inverters, servomotors, PLCs and other industrial equipment, as well as energy-efficient, inverter-based home appliances.

The new FM4 family includes 84 MCUs in its MB9B560R/460R/360R/160R series. The devices operate from 3V and 5V power supplies, with a variety of memory options including SRAM, NOR flash, NAND flash and SDRAM. They feature an ultra-wide bus for onboard flash memory that enables read access with no CPU wait state, speeding processing and reducing power requirements.

The Cortex-M4 core incorporates DSP and FPU functions that provide the power required for advanced computations. Algorithms for operating onboard flash memory have been redesigned for greater speed and lower power consumption. The current required when running the real time clock (RTC) mode can be limited to approximately 1.5?A, making these high-performance MCUs useful for applications that require very low standby power. The devices support 100,000 rewrite cycles with 20 year data retention.

The FM4 family also includes enhanced peripheral functions and redesigned analogue circuitry. New trimming functions deliver internal oscillator accuracy of +2 per cent. The D/A converter can achieve 12bit resolution, and the 12bit A/D converter operates at twice the speed of previous versions.

In addition, the multi-function timer for the three-phase motors features a number of enhanced functions, including support for asymmetric PWM waveform output and multiple A/D start triggers. Minimum timing resolution can be as low as 6.25ns. The enhanced timer functions, in conjunction with an improved A/D convertor, enable precise motor control with better energy efficiency.

To accelerate SPI communications, the MCUs can support up to a 20MHz clock rate and variable data lengths up to 16 bits. The new communications IP with DSTC (Descriptor System data Transfer Controller) improves high-speed serial data communications, while reducing the CPU's workload and software overhead.

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