H8S2639 Datasheet, PDF (802/1547 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2600 Series

Section 21A ROM (H8S/2636 Group)
21A.4.5 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.
Flash memory
Emulation block
SCI
RAM
Overlap RAM
(emulation is performed
on data written in RAM)
Application program
Execution state
Figure 21A-4 Reading Overlap RAM Data in User Mode or 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.
Rev. 6.00 Feb 22, 2005 page 742 of 1484
REJ09B0103-0600