Datasheet

Section 19 Flash Memory (F-ZTAT Version)
Rev. 3.00 Mar 17, 2006 page 777 of 926
REJ09B0283-0300
Flash memory
This LSI
RAM
Host
Programming/
erase control program
SCI
Boot program
New application
program
Flash memory
This LSI
RAM
Host
SCI
New application
program
Flash memory
This LSI
RAM
Host
SCI
Flash memory
erase
Boot program
New application
program
Flash memory
This LSI
Program execution state
RAM
Host
SCI
Boot program
Boot program
FWE assessment
program
Application program
(old version)
New application
program
1. Initial state
(1) The FWE assessment program that confirms
that user program mode is entered, and (2) 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. (3) 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 the 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
Note: The FWE assessment program is not available in the H8S/2678R Group.
Figure 19.4 User Program Mode