SH7144_08 Datasheet, PDF (718/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

19. Flash Memory (F-ZTAT Version)
19.7 Flash Memory Emulation in RAM
A setting in the RAM emulation register (RAMER) enables part of RAM to overlap with the flash
memory area so that data to be written to flash memory can be emulated in RAM in real time.
Emulation can be performed in user mode or user program mode. Figure 19.7 shows an example
of emulation of real-time flash memory programming.
1. Set RAMER to overlap part of RAM with the area for which real-time programming is
required.
2. Emulation is performed using the overlapped RAM.
3. After the program data has been confirmed, the RAMS bit is cleared, thus releasing the RAM
overlap.
4. The data written in the overlapped RAM is written into the flash memory area.
Start of emulation program
Set RAMER
Write tuning data to
overlapped RAM
Execute application program
No
Tuning OK?
Yes
Clear RAMER
Write to flash memory
emulation block
End of emulation program
Figure 19.7 Flowchart for Flash Memory Emulation in RAM
Rev.4.00 Mar. 27, 2008 Page 674 of 882
REJ09B0108-0400