HD64F3028F25 Datasheet, PDF (644/925 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

18.8 Flash Memory Emulation in RAM
Making a setting in the RAM control register (RAMCR) 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 RAMCR 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 18.13 shows an example of emulation of realtime flash memory
programming.
Start of emulation program
Set RAMCR
Write tuning data to overlap RAM
Execute application program
No
Tuning OK?
Yes
Clear RAMCR
Write to flash memory emulation block
End of emulation program
Figure 18.13 Flowchart of Flash Memory Emulation in RAM
Rev. 2.00, 09/03, page 612 of 890