D12320VF25IV Datasheet, PDF (805/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

19.9 Flash Memory Emulation in RAM
Section 19 ROM
19.9.1 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 19.17 shows an example of emulation of real-time flash memory
programming.
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 19.17 Flowchart for Flash Memory Emulation in RAM
Rev.6.00 Sep. 27, 2007 Page 773 of 1268
REJ09B0220-0600