HD6432345 Datasheet, PDF (568/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

Flash Memory Emulation in RAM: Emulation should be performed in user mode or user
program mode. When the emulation block set in RAMER is accessed while the emulation function
is being executed, data written in the overlap RAM is read.
• Reading Overlap Data in User Mode and User Program Mode
Flash memory
Emulation block
Application program
Execution state
SCI
RAM
Overlap RAM
(emulation is performed
on data written in RAM)
Figure 17.11 Reading Overlap Data in User Mode and User Program Mode
• Writing Overlap Data in User Program Mode
When overlap RAM data is confirmed, the RAMS bit is cleared, RAM overlap is released, and
writes should actually be performed to the flash memory.
When the programming control program is transferred to RAM, ensure that the transfer
destination and the overlap RAM do not overlap, as this will cause data in the overlap RAM to
be rewritten.
Flash memory
Programming data
Application program
SCI
RAM
Overlap RAM
(programming data)
Programming control
program execution state
Figure 17.12 Writing Overlap Data in User Program Mode
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