D12320VF25IV Datasheet, PDF (908/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 ROM
19.24.2 User Program Mode
When set to user program mode, the chip can program and erase its flash memory by executing a
user program/erase control program. Therefore, on-board programming of the on-chip flash
memory can be carried out by providing ahead of time an on-board FWE control means to supply
programming data, and storing a program/erase control program in part of the program area if
necessary.
To select user program mode, select a mode that enables the on-chip flash memory (mode 6 or 7)
and apply a high level to the FWE pin. In this mode, on-chip supporting modules other than flash
memory operate as they normally would in modes 6 and 7.
While the SWE1 bit is set to 1 to perform programming or erasing for the addresses H'000000 to
H'03FFFF, this address area cannot be read. While the SWE2 bit is set to 1 to perform
programming or erasing for the addresses H'040000 to H'07FFFF, this address area cannot be
read. The control program that performs programming and erasing should be run in on-chip RAM
or flash memory except for the above address areas. When the program is located in external
memory, an instruction for programming the flash memory and the following instruction should
be located in on-chip RAM.
Figure 19.70 shows the procedure for executing the program/erase control program when
transferred to on-chip RAM.
Rev.6.00 Sep. 27, 2007 Page 876 of 1268
REJ09B0220-0600