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685
User program mode
;
;;
;;;
3. Initializing the flash memory
Execute the Programming/erase program in RAM to
initialize (to H'FF) the flash memory. Erase is executed
in block units, but cannot be executed in byte units.
HOST
HOST
HOST
HOST
Programming/erase
control program
New application
program
New application
program
New application
program
LSI
LSI
LSI
Boot program
Flash memory
FWP verify program
Transfer program
Application program
(old version)
RAM
Boot program
Flash memory
FWP verify program
Transfer program
RAM
SCI
Boot program
Flash memory
FWP verify program
Transfer program
Application program
(old version)
RAM
LSI
Boot program
<Flash memory>
FWP verify program
Transfer program
RAM
SCI
SCI
SCI
Programming
control program
;;;
Programming
control program
Programming
control program
Program execution state
New application
program
Flash memory
erase
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.
1. Initial state
The FWP assessment program that confirms that
user program mode has been entered, 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.
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.
Figure 22.4 User Program Mode
Содержание SH7041 Series
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