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Rev. 1.00, 05/04, page 435 of 544
<Flash memory>
<This LSI>
<RAM>
<Host>
Programming/
erase control program
SCI
Boot program
New
application program
<Flash memory>
<This LSI>
<RAM>
<Host>
SCI
New
application program
<Flash memory>
<This LSI>
<RAM>
<Host>
SCI
Flash memory
erase
Boot program
New
application program
<Flash memory>
<This LSI>
Program execution state
<RAM>
<Host>
SCI
Boot program
Programming/
erase control program
Boot program
Transfer program
Application
program
(old version)
Application
program
(old version)
New
application
program
Transfer program Transfer program
Programming/
erase control program
Programming/
erase control program
Transfer program
1. Initial state
(1) 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.
(2) The programming/erase control program should be
prepared in the host or in the flash memory.
2. Programming/erase control program transfer
The transfer program in the flash memory is executed and
the programming/erase control program is transferred 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.
Figure 18.4 User Program Mode (Example)