Renesas H8S/2319 series Hardware Manual page 646

• 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.
Programming/
erase control program
New application
program
Chip
Boot program
Flash memory
Transfer program
Application program
(old version)
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.
New application
program
Chip
Boot program
Flash memory
Transfer program
Flash memory
erase
Rev. 5.00, 12/03, page 616 of 1088
Host
SCI
RAM
Host
SCI
RAM
Programming/
erase control program
Figure 17-36 User Program Mode (Example)
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)
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
Chip
Boot program
Flash memory
Transfer program
New application
program
SCI
RAM
Programming/
erase control program
SCI
RAM
Programming/
erase control program
Program execution state