D12320VF25V Datasheet, PDF (639/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

17.9 Flash Memory Emulation in RAM
Section 17 ROM
17.9.1 Emulation in RAM
Making a setting in the RAM emulation register (RAMER) enables part of RAM to be overlapped
onto the flash memory area so that data to be written to flash memory can be emulated in RAM in
real time. After the RAMER setting has been made, accesses can be made from the flash memory
area or the RAM area overlapping flash memory. Emulation can be performed in user mode and
user program mode. Figure 17.18 shows an example of emulation of real-time flash memory
programming.
Note: Flash memory emulation by RAM is not supported in the H8S/2314 F-ZTAT.
Start of emulation program
Set RAMER
Write tuning data to overlap
RAM
Execute application program
No
Tuning OK?
Yes
Clear RAMER
Write to flash memory emulation
block
End of emulation program
Figure 17.18 Flowchart for Flash Memory Emulation in RAM
Rev.7.00 Feb. 14, 2007 page 605 of 1108
REJ09B0089-0700