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1. Initial state
The means for entering the user program mode
has been prepared, and the program that will
transfer the programming/erase control program
from flash memory to on-chip RAM should be
written into the flash memory by the user
beforehand. The programming/erase control
program should be prepared in the host or in the
flash memory.
Programming/
erase control program
New application
program
H8/3664
Boot program
Flash memory
Assessment
program
Transfer program
Application program
(old version)
3. Flash memory initialization
The programming/erase program in RAM is
executed, and the flash memory is initialized (to
H'FF). Erasing can be performed in block units,
but not in byte units.
New application
program
H8/3664
Boot program
Flash memory
Assessment
program
Transfer program
Flash memory
erase
102
Host
SCI3
RAM
Host
SCI3
RAM
Programming/
erase control program
Figure 7.4 User Program Mode
2. Programming/erase control program transfer
When user program mode is entered, user
software confirms this fact, executes transfer
program in the flash memory, and transfers the
programming/erase control program to RAM.
Host
New application
program
H8/3664
Boot program
Flash memory
Assessment
program
Transfer program
Application program
(old version)
4. Writing new application program
Next, the new application program in the host is
written into the erased flash memory blocks. Do
not write to unerased blocks.
Host
H8/3664
Boot program
Flash memory
Assessment
program
Transfer program
New application
program
SCI3
RAM
Programming/
erase control program
SCI3
RAM
Programming/
erase control program
Program execution state
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