Differences Between Boot Mode And User Program Mode - Hitachi H8S/2338 Series Hardware Manual

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
Figure 17-7 Writing Overlap RAM Data in User Program Mode
17.4.6

Differences between Boot Mode and User Program Mode

Entire memory erase
Block erase
Programming control program*
Note: * To be provided by the user, in accordance with the recommended algorithm.
550
Boot Mode
Yes
No
Program/program-verify
SCI
RAM
Overlap RAM
(programming data)
Programming control
program
Execution state
User Program Mode
Yes
Yes
Erase/erase-verify/program/
program-verify emulation