D12320VF25V Datasheet, PDF (611/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
Writing Overlap RAM 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 17.7 Writing Overlap RAM Data in User Program Mode
17.4.6 Differences between Boot Mode and User Program Mode
Table 17.4 Differnces between Boot Mode and User Program Mode
Boot Mode
User Program Mode
Entire memory erase
Yes
Yes
Block erase
Programming control program^*
No
Program/program-verify
Yes
Erase/erase-verify/program/
program-verify/emulation
Note: * To be provided by the user, in accordance with the recommended algorithm.
Rev.7.00 Feb. 14, 2007 page 577 of 1108
REJ09B0089-0700