D12320VF25IV Datasheet, PDF (829/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 19 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 19.34 Writing Overlap RAM Data in User Program Mode
19.13.6 Differences between Boot Mode and User Program Mode
Table 19.25 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.6.00 Sep. 27, 2007 Page 797 of 1268
REJ09B0220-0600