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Microcontrollers FLASH vs ROM

Discussion in 'Electronic Components' started by Andros, Feb 14, 2006.

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  1. Andros

    Andros Guest

    Hi there, first excuseme for my english...

    Time ago I have had a question about microcontrollers with flash memory
    and rom memory. Which are the difference between them?, apart of the
    feature of flash memory to be reprogramed, there is any difference in
    cost or any else fact?, which are the advantage of ROM
    microcontrollers?, for examle the PIC18F252 and PIC18C252. For desing
    stuff is clear that FLASH micros are better, but in production?, which
    are better?

  2. According to Microchip, there is no best. It's just a matter of money. Flash
    is the most expensive and the most flexible. Usefull for development and
    designs that may need to keep the possibility for changing or upgrading.
    OTPs are less expensive but still requires programing. Usefull for small and
    medium quantities. ROM is the cheapest but only for very large volumes.

    petrus bitbyter
  3. Microchip seem to be migrating to all flash. OTP and ROM is more
    secure against accidental erasure, and may be cheaper in quantity.
    As Petrus said, cost is the main factor when it comes to mask-ROM. You
    cannot get a flash or OTP micro cheap enough to make most toys or
    low-end LCD games, for example. The programmable versions are working
    their way down the food chain and you'll currently find them in many
    high-volume consumer products such as CO detectors and timers.

    Best regards,
    Spehro Pefhany
  4. Andros

    Andros Guest

  5. Ian Bell

    Ian Bell Guest

    Depends on quantities. For small quantities Flash is best but is you get to
    a million parts a year then masked ROM will be cheaper.

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