D12320VF25V Datasheet, PDF (775/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
17.26 Flash Memory Emulation in RAM
To provide real-time emulation in RAM of data that is to be written to the flash memory, a part of
the RAM can be overlaid on an area of flash memory (user MAT) that has been specified by the
RAM emulation register (RAMER). After the RAMER setting is made, the RAM is accessible in
both the user MAT area and as the RAM area that has been overlaid on the user MAT area. Such
emulation is possible in both user mode and user-program mode.
Figure 17.76 shows an example of the emulation of realtime programming of the user MAT area.
Start of emulation program
Set RAMER
Write the data for tuning to
the overlaid RAM area
Execute application program
No
Tuning OK?
Yes
Cancel RAMER setting
Program the user MAT
with the emulated block
End of emulation program
Figure 17.76 Emulation of Flash Memory in RAM
Rev.7.00 Feb. 14, 2007 page 741 of 1108
REJ09B0089-0700