Datasheet

Rev.6.00 Oct.28.2004 page 623 of 1016
REJ09B0138-0600H
• User program mode
Flash memory
Chip
RAM
Host
Programming/
erase control program
SCI
Boot program
New application
program
Flash memory
Chip
RAM
Host
SCI
New application
program
Flash memory
Chip
RAM
Host
SCI
Flash memory
erase
Boot program
New application
program
Flash memory
Chip
Program execution state
RAM
Host
SCI
Boot program
Boot program
Application program
(old version)
New application
program
1. Initial state
(1) The program that will transfer the
programming/erase control program to on-chip
RAM should be written into the flash memory by
the user beforehand. (2) The programming/erase
control program should be prepared in the host
or in the flash memory.
2. Programming/erase control program transfer
Executes the transfer program in the flash
memory, and transfers the programming/erase
control program to RAM.
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.
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.
Programming/
erase control program
Programming/
erase control program
Programming/
erase control program
Application program
(old version)
Transfer program
Transfer program
Transfer program
Transfer program
Figure 19-39 User Program Mode (Example)