HD6432646 Hitachi, HD6432646 Datasheet - Page 696

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

20.2.4
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.
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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.
Figure 20-3 Reading Overlap RAM Data in User Mode or User Program Mode
Flash Memory Emulation in RAM
Application program
Emulation block
Execution state
Flash memory
(emulation is performed
on data written in RAM)
Overlap RAM
RAM
SCI