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Section 24 ROM
6. Do not perform additional programming. Programming must be performed in the erased state.
Program the area with 128-byte programming-unit blocks in on-board programming or
programmer mode only once.
Perform programming in the state where the programming-unit block is fully erased.
7. Ensure that the PROM programmer is correctly attached before programming.
If the socket, socket adapter, or product index does not match the specifications, too much
current flows and the product may be damaged.
8. Do not touch the socket adapter or LSI while programming.
Touching either of these can cause contact faults and write errors.
9. Allocate data or programs to be written to the flash memory to addresses higher than that of
the external interrupt vector table.
To write data or programs to the flash memory, data or programs must be allocated to
addresses higher than that of the external interrupt vector table (H'00040 in advanced mode
and H'0020 in normal mode) and H'FF must be written to the areas that are reserved for the
system in the exception handling vector table.
10. Write H'FF to the entire key code area for reading in programmer mode.
If data other than H'FF is written to the key code area (advanced mode: H'00003C to
H'00003F, normal mode: H'001E to H'001F) of flash memory, reading cannot be performed in
programmer mode. (In this case, data is read as H'00. Rewrite is possible after erasing the
data.) For reading in programmer mode, make sure to write H'FF to the entire key code area.
If data other than H'FF is to be written to the key code area in programmer mode, a verification
error will occur unless a software countermeasure has been taken for the PROM programmer.
Rev. 3.00 Jan 25, 2006 page 740 of 872
REJ09B0286-0300
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