SH7014 Datasheet, PDF (527/754 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

User Program Mode
1. Initial state
The FWP 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
SH7017
Boot program
Flash memory
FWP assessment
program
Transfer program
SCI
RAM
Application program
(old version)
18. 128 kB Flash Memory (F-ZTAT)
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
SH7017
Boot program
Flash memory
FWP 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
SH7017
Boot program
Flash memory
FWP assessment
program
Transfer program
Flash memory
erase
SCI
RAM
Programming/
erase control program
SH7017
Boot program
Flash memory
FWP assessment
program
New application
program
SCI
RAM
Programming/
erase control program
Program execution state
Figure 18.4 User Program Mode
Rev.5.00 Sep. 27, 2007 Page 493 of 716
REJ09B0398-0500