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ST beefs up on-chip flash of ARM-based MCUs

Posted: 15 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:MCU? ARM966E-S? CPU core? expand flash memory?


STMicroelectronics has increased the on-chip flash capacity of its STR91xFA ARM966E-S based MCU family by introducing 1.1Mbyte and 2.1Mbyte variants, delivering higher memory density than any other ARM9, or ARM7-TDMI, based standard MCU currently available.

The new devices are pin- and function compatible with existing 288Kbyte and 544Kbyte versions in LQFP-80, LQFP-128 and BGA-144 packages, allowing engineers to scale designs easily without incurring expensive changes to their circuit boards.

As the first family to combine the ARM966E-S CPU core with Ethernet connectivity and large memory capacity including 96Kbytes of SRAM, the STR91xFA series now further extends the performance of networked embeddable systems such as web servers, printer controllers and other applications that require large amounts of code or data storage. These applications also include POS terminals and peripherals, factory-automation equipment, serial-protocol gateways, security and surveillance equipment and building-automation systems.

The 1.1Mbyte STR91xFAx46 and 2.1Mbyte STR91xFAx47 enable engineers to build more complex embedded functionality using on-chip memory, thus adding security against piracy, saving board space as well as BOMs costs. With integrated Ethernet, USB and CAN interfaces, as well as a 10bit ADC, multiple timers and up to 80 5V-tolerant general-purpose I/Os, the STR910xFA delivers a single-chip solution capable of transforming embedded-control applications into low-cost nodes on a local network, or on the Internet.

Designers using the new STR91x devices in Ethernet-based solutions can also take advantage of the royalty-free TCP/IP stack recently announced by ST, which accelerates application development while occupying a footprint of less than 12Kbyte of memory.

The ARM966E-S CPU core at the heart of the STR91x family achieves 96 MIPS peak performance at 96MHz, by introducing several performance enhancements over the ARM7TDMI architecture. These include separate internal busses to high-speed burst flash memory and zero-latency SRAM, each attached efficiently to the core through a highly optimized Tightly-Coupled Memory (TCM) interface for rapid access.

In addition, the ARM966E-S core supports single-cycle DSP instructions, enabling the STR910F to satisfy both control and signal-processing requirements and delivering clear advantages over traditional solutions based on separate DSP and control processors.

The STR91xFA46 and STR91xFA47 are available immediately at prices starting from $6.89 in quantities of 10,000 units per year.

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