Datasheet

Table Of Contents
Section 19 Flash Memory (F-ZTAT Version)
Page 650 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
19.7 Flash Memory 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. Emulation can be performed in user mode or user program mode. Figure 19.9 shows an
example of emulation of real-time flash memory programming.
1. Set RAMER to overlap part of RAM onto the area for which real-time programming is
required.
2. Emulation is performed using the overlapping RAM.
3. After the program data has been confirmed, the RAMS bit is cleared, thus releasing RAM
overlap.
4. The data written in the overlapping RAM is written into the flash memory space (EB0).
Start of emulation program
Set RAMER
Write tuning data to overlap
RAM
Execute application program
Tuning OK?
Clear RAMER
Write to flash memory
emulation block
End of emulation program
No
Ye s
Figure 19.9 Flowchart for Flash Memory Emulation in RAM