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Is it possible to use the reserved area of ROM?

Latest Updated:09/29/2006

Question:

(ROM)  The datasheet and user's manual state that the first 128 bytes and the last 2 bytes of ROM are reserved for product testing, and the rest is user area. Can the reserved area be used? [2006/09/29]

Answer:

  1. Flash Memory version
    The reserved areas can be used.
  2. QzROM version and Mask ROM version
    Please do not use the reserved area.

Supplemental note:
When the QzROM version or Mask ROM version are mass produced, user programs cannot be written into the reserved area because the area is occupied by testing programs. Care should be taken when switching from Flash Memory version to Mask ROM version or QzROM version.

(#105523)

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