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For Ultimate Performance Gains Up to 15x, Upgrade with an MCS® 251 Microcontroller

In today's competitive product environment, you can't stand still. Adding features, functionality and higher performance has become a necessity. If you want to position your copier, scanner, printer, POS terminal, CD-ROM drive, modem or other PC- or communications-related device at the high end of the performance scale, you need to look at the MCS 251 microcontroller.

Intel's MCS® 251 microcontroller gives you a fast and cost-effective way to catapult your legacy MCS® 51 microcontroller-based designs into the 21st century. While moving existing MCS 51 microcontroller designs to the MCS 251 microcontroller requires some code rewrites, the results can be breathtaking up to a 15X performance increase with minimal development effort.

Here are a few more reasons to consider moving up to the MCS 251 microcontroller:

  • High-end performance for embedded applications
  • Increased programming flexibility and efficient C language support
  • Supports bigger code and data memory requirements
  • Reduced code size
  • Reduced power consumption and RFI at low clock speeds
  • Simple upgrade from MCS 51 and MCS® 151 microcontroller applications

    Advanced Feature Set
    The Intel MCS 251 microcontroller is a direct descendent of the classic MCS 51 architecture, but features state-of-the-art performance and an advanced feature set. The MCS 251 microcontroller is equipped with a register-based CPU architecture with a 40-byte register file accessible as bytes, words and double words, for programming flexibility as well as increased performance.

    Its enhanced MCS 51 microcontroller instruction set includes 16- and 32-bit arithmetic and logic instructions, compare and conditional jump instructions, and an expanded set of move instructions that give you dramatically enhanced performance , simpler programming and smaller code size. The MCS 251 microcontroller also features 18-bit linear code/data addressing with 256Kbyte extended stack space.

    Extensive memory options are also available, including 512 byte or 1 Kbyte of on-chip data RAM or a choice of 8 or 16 Kbytes of on-chip ROM/OTPROM or ROMless options.

    A Choice of Memory Options
    In addition to the already advanced feature set of our MCS 251 microcontroller, Intel offers three more versions of the MCS 251 microcontroller that provide a choice in the amounts of internal ROM/EPROM and RAM.

    These members of the MCS 251 microcontroller family are the 8xC251SA, 8xC251SPand 8xC251SQ. All are based on the high-performance MCS 251 microcontroller architecture. These advanced microcontrollers not only provide significant performance improvements over MCS 51 microcontroller architecture, they offer you a choice of RAM and ROM memory options, and flexible pricing options.

    The 8xC251SA/SB/SP/SQ and 8xC251TA/TB/TP/TQ are binary code and pin-compatible with existing MCS 51 microcontrollers, so they offer you the fastest and easiest way to achieve ultimate performance from your existing MCS 51 microcontroller applications.

    For high performance, the 8xC251SA/SB/SP/SQ and 8xC251TA/TB/TP/TQ share the MCS 251 controller's advanced register-based CPU architecture and also have pipelined instruction execution units. These microcontrollers employ the powerful MCS 251 microcontroller instruction set, with many enhanced 8-, 16- and 32-bit instructions available. They also execute C code efficiently.

    Flexible RAM, ROM/EPROM and Pricing
    MCS 251 microcontrollers range in price from $5.50 to $6.50 in 100K unit direct OEM pricing for ROM products. All are available as standard 5V 16 MHz parts and are available in commercial as well as extended temperature range.

    Product options are:
    8xC251SA--8K ROM/OTPROM and 1K RAM
    8xC251SB--16K ROM/OTPROM and 1K RAM
    8xC251SP--8K ROM/OTPROM and 512B RAM
    8xC251SQ--16K ROM/OTPROM and 512B RAM
    8xC251TA--8K ROM and 1K RAM
    8xC251TB--16K ROM and 1K RAM
    8xC251TP--8K ROM and 512B RAM
    8xC251TQ--16K ROM and 512B RAM
    ROMless versions are also available

    8xC251SA/SB/SP/SQ: up to 16 MHz (speed)
    8xC251TA/TB/TP/TQ: up to 24 MHz (speed) plus 2nd UART capability

    The 8xC251 microcontrollers are available in 40-pin PDIP and 44-pin PLCC packages.

    Fast and Easy Development
    Intel and its third-party vendors offer a variety of hardware and software development tools to make your MCS 251 controller development as fast as possible. Intel's ApBUILDER interactive programming software shortens your learning curve, reduces your total design time, and speeds your migration to the MCS 251 architecture.

    To keep your edge in today's product environment, you need to look at the clear advantages of the MCS 251 microcontroller--before your competition does.

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