HD64F2357F20V Datasheet, PDF (609/1049 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-chip Microcomputer H8S Family / H8S/2300 Series

Flash Memory Emulation in RAM
• Reading Overlap Data in User Mode and User Program Mode
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.
Flash memory
Emulation block
Application program
Execution state
SCI
RAM
Overlap RAM
(emulation is performed
on data written in RAM)
Figure 19-11 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 19-12 Writing Overlap Data in User Program Mode
Rev.6.00 Oct.28.2004 page 579 of 1016
REJ09B0138-0600H