HD64F2357VF13 Datasheet, PDF (653/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

• User program mode
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.
Host
Programming/
erase control program
New application
program
Chip
Boot program
Flash memory
Transfer program
SCI
RAM
,
Application program
(old version)
2. Programming/erase control program transfer
Executes the transfer program in the flash
memory, and transfers the programming/erase
control program to RAM.
Host
New application
program
Chip
Boot program
Flash memory
Transfer program
Application program
(old version)
SCI
RAM
Programming/
erase control program
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.
Host
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
New application
program
Chip
Boot program
Flash memory
Transfer program
Flash memory
erase
SCI
RAM
Programming/
erase control program
Chip
Boot program
Flash memory
Transfer program
New application
program
SCI
RAM
Programming/
erase control program
Program execution state
,
! ^{Figure 19-39 User Program Mode (Example)}
Rev.6.00 Oct.28.2004 page 623 of 1016
REJ09B0138-0600H