HD64F3048F16 Datasheet, PDF (606/903 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 18 ROM (H8/3048F-ONE: Single Power Supply, H8/3048B Mask ROM Version)
State transitions between the normal user mode and on-board programming mode are performed
by changing the FWE pin level from high to low or from low to high. To prevent misoperation
(erroneous programming or erasing) in these cases, the bits in the flash memory control registers
(FLMCR1 and FLMCR2) should be cleared to 0 before making such a transition. After the bits are
cleared, a wait time is necessary. Normal operation is not guaranteed if this wait time is
insufficient.
Rev. 3.00 Sep 27, 2006 page 578 of 872
REJ09B0325-0300