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L
lwang
Visitor II
June 3, 2004
Question

Execute-Only-Memory

  • June 3, 2004
  • 2 replies
  • 594 views
Posted on June 03, 2004 at 13:39

Execute-Only-Memory

    This topic has been closed for replies.

    2 replies

    L
    lwangAuthor
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:01

    I am using uPSD33xx. I would like to make one of the Secondary Flash Sector ''execute-only''. That is, I want Code in other Sectors be able to CALL or JUMP to Code in this Sector but unable to use MOVC to read contains of this Sector.

    Can I use the CPLD to accomplish this? Where can I find more information about the CPLD in uPSD33xx? The datasheet does not seem to provide enough information about the details of the Macrocells.

    J
    jdaniel
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 12:01

    Lichen,

    I think you're going to be out of luck on that one. Unfortunately, all methods in the 8032 core that access ''code memory'' utilize the PSEN signal and from a hardware perspective, there's no easy way to distinguish between a code fetch for execution and a fetch from a MOVC.

    Best Regards,

    Phaze426
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