HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 597
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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17.11
17.11.1 Emulation in RAM
Since programming or erasing the flash memory takes time, it may be difficult to perform tuning
by overwriting parameters and other data in real time. In such cases, 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 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 17.24 shows an example of emulation of real-time flash memory programming.
Flash Memory Emulation in RAM
Figure 17.24 Flowchart for Flash Memory Emulation in RAM
No
Write to flash memory emulation
Execute application program
Write tuning data to overlap
End of emulation program
Start emulation program
Clear RAMER
Set RAMER
Tuning OK?
RAM
block
Yes
585
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