D12320VF25V Datasheet, PDF (650/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.11.5 Auto-Program Mode
• In auto-program mode, 128 bytes are programmed simultaneously. For this purpose, 128
consecutive byte data transfers should be performed.
• A 128-byte data transfer must be performed even if writing fewer than 128 bytes; in this case,
H'FF data must be written to the extra addresses.
• The lower 7 bits of the transfer address must be held low. If an invalid address is input,
memory programming will be started but a programming error will occur.
• Memory address transfer is executed in the second cycle (figure 17.26). Do not perform
transfer later than the second cycle.
• Do not perform a command write during a programming operation.
• Perform one auto-programming operation for a 128-byte block for each address. One or more
additional programming operations cannot be carried out on address blocks that have already
been programmed.
• Confirm normal end of auto-programming by checking I/O₆. Alternatively, status read mode
can also be used for this purpose (the I/O₇ status polling pin is used to identify the end of an
auto-program operation).
• Status polling I/O₆ and I/O₇ information is retained until the next command write. As long as
the next command write has not been performed, reading is possible by enabling CE and OE.
Rev.7.00 Feb. 14, 2007 page 616 of 1108
REJ09B0089-0700