HD64F3048VTF8 Datasheet, PDF (608/903 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip

Section 18 ROM (H8/3048F-ONE: Single Power Supply, H8/3048B Mask ROM Version)
User Program Mode
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.
Host
Programming/
erase control program
New application
program
H8/3048F-ONE
Boot program
Flash memory
FWE assessment
program
Transfer program
SCI
RAM
Application program
(old version)
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.
Host
New application
program
H8/3048F-ONE
Boot program
Flash memory
FWE assessment
program
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
H8/3048F-ONE
Boot program
Flash memory
FWE assessment
program
Transfer program
Flash memory
erase
SCI
RAM
Programming/
erase control program
H8/3048F-ONE
Boot program
Flash memory
FWE assessment
program
Transfer program
New application
program
SCI
RAM
Programming/
erase control program
Note: Never apply 12 V to the H8/3048F-ONE (single power supply).
Otherwise, the LSI will be permanently damaged.
Program execution state
Rev. 3.00 Sep 27, 2006 page 580 of 872
REJ09B0325-0300