3069RF-ZTAT Datasheet, PDF (654/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

18.7 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 control register (RAMCR). After the RAMCR 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.
Figures 18.17 and 18.18 show an example of the emulation of realtime programming of the user
MAT area.
Start of emulation program
Set RAMCR
Write the data for tuning to
the overlaid RAM area
Execute application program
No
Tuning OK?
Yes
Cancel RAMCR setting
Program the user MAT
with the emulated block
End of emulation program
Figure 18.17 Emulation of Flash Memory in RAM
Rev. 5.0, 09/04, page 632 of 978