Performance, flexibility, upgradability are key factors for embedded controller applications. National Semiconductor says its solution for this is CompactRISC - powerful 16 bit RISC controllers with integrated flash memory, A/D converter, CAN interface, multifunction timers, general-purpose I/Os and more. CompactRISC is not a single device but a family that broadens the designers' choice and offers future upgradability. As an example, the CR16MCS9 is the latest device in the family that integrates the CR16 core with 25 MHz, 64 KB flash memory, 3 KB SRAM, 2176 bytes of EEPROM and all the above-mentioned peripherals.
The CR16MCS9 and CR16MCS5 are general-purpose 16 bit microcontrollers based on RISC architecture. The device operates as a complete microcomputer with all system timing, interrupt logic, flash program memory or ROM memory, RAM, EEPROM data memory and I/O ports included on-chip. The CR16MCS9 and CR16MCS5 offer the high performance of a RISC architecture while retaining the advantages of a traditional complex instruction set computer (CISC): compact code, on-chip memory and I/O, and reduced cost. The CPU uses a three-stage instruction pipeline that allows execution of up to one instruction per clock cycle, or up to 25 million instructions per second (MIPS) at a clock rate of 25 MHz. The devices contain a full-CAN class, CAN serial interface for low/high-speed applications with 15 orthogonal message buffers, each supporting standard as well as extended message identifiers.
The CR16 family is ideally suited to a wide range of embedded controller applications because of its high performance, on-chip integrated features and low power consumption resulting in decreased system cost.
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