Datasheet

Section 17 Flash Memory (F-ZTAT Version)
Rev.7.00 Dec. 24, 2008 Page 557 of 698
REJ09B0074-0700
Flash memory
This LSI
RAM
Host
Programming/
erase control program
Boot program
New application
program
Flash memory
This LSI
RAM
Host
New application
program
Flash memory
This LSI
RAM
Host
Flash memory
erase
Boot program
New application
program
Flash memory
This LSI
Program execution stat
e
RAM
Host
Boot program
Boot program
FWE assessment
program
Application program
(old version)
New application
program
1. Initial state
The FWE 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.
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
Transfer program
Application program
(old version)
Transfer program
FWE assessment
program
FWE assessment
program
Transfer program
FWE assessment
program
Transfer program
SCI
or USB
SCI
or USB
SCI
or USB
SCI
or USB
Figure 17.4 User Program Mode (Sample)