HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 772

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

• User program mode
Rev.4.00 Sep. 07, 2007 Page 742 of 1210
REJ09B0245-0400
1.
3.
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.
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.
Chip
Chip
Application program
Transfer program
Transfer program
Flash memory
Flash memory
Flash memory
Boot program
Boot program
(old version)
erase
erase control program
New application
New application
Programming/
program
program
Host
Host
Figure 19.5 User Program Mode (Example)
erase control program
Programming/
RAM
RAM
SCI
SCI
2.
4.
Chip
Chip
Programming/erase control program transfer
Executes the transfer program in the flash
memory, and transfers the programming/erase
control program to RAM.
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.
Application program
Transfer program
Transfer program
New application
Flash memory
Flash memory
Boot program
Boot program
(old version)
program
New application
program
Host
Host
erase control program
erase control program
Programming/
Programming/
Program execution state
RAM
RAM
SCI
SCI