HD64F3039F18 Datasheet, PDF (484/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 15 ROM
3. See section 4.2.2, Reset Sequence and 15.9, Notes on Flash Memory
Programming/Erasing. With the mask ROM version of the H8/3039, H8/3038,
H8/3037, and H8/3036, the minimum reset period during operation is 10 system
clocks. However, the flash memory versions of the H8/3039 requires a minimum of 20
system clocks.
15.4.2 User Program Mode
When set to the user program mode, this LSI can erase and program its flash memory by executing
a user program. Therefore, on-chip flash memory on-board programming can be performed by
providing a means of controlling FWE and supplying the write data on the board and providing a
write program in a part of the program area.
To select this mode, set the LSI to on-chip ROM enable modes 5 and 7 and apply a high level to
the FWE pin. In this mode, the peripheral functions, other than flash memory, are performed the
same as in modes 5 and 7.
Since the flash memory cannot be read while it is being programmed/erased, place a programming
program on external memory, or transfer the programming program to RAM area, and execute it
in the RAM. In mode 6, do not program/erase the flash memory. When setting mode 6, always
input low level to the FWE pin.
Figure 15.9 shows the procedure for executing when transferred to on-chip RAM. During reset
start, starting from the user program mode is possible.
Rev.3.00 Mar. 26, 2007 Page 460 of 682
REJ09B0353-0300