HD6432621 Hitachi, HD6432621 Datasheet - Page 695

• Manufacturer Part Number: HD6432621
• Description: (HD64F262x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

19.9
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. After the RAMER setting has been made, accesses cannot 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 19-14 shows an example of emulation of real-time flash
memory programming.
Flash Memory Emulation in RAM
Figure 19-14 Flowchart for Flash Memory Emulation in RAM
No
Write to flash memory emulation
Execute application program
Write tuning data to overlap
Start of emulation program
End of emulation program
Clear RAMER
Set RAMER
Tuning OK?
RAM
block
Yes
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