Datasheet

Section 20 Flash Memory (0.35-μm F-ZTAT Version)
Rev.7.00 Mar. 18, 2009 page 837 of 1136
REJ09B0109-0700
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
Application program
(old version)
New application
program
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.
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 in
itialization
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 applicati
on 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
Transfer program
Transfer program
Figure 20.4 User Program Mode