D12320VF25V Datasheet, PDF (767/1146 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 17 ROM
[6] After erasure finishes, clear FKEY and specify software protection.
If this LSI is restarted by a power-on reset immediately after user MAT erasure has finished,
secure a reset period (period of RES = 0) that is at least as long as normal 100 μs.
Erasing and Programming Procedure in User Program Mode: By changing the on-chip RAM
address of the download destination in FTDAR, the erasing program and programming program
can be downloaded to separate on-chip RAM areas.
Figure 17.72 shows an example of repetitively executing RAM emulation, erasing, and
programming.
Start procedure program
Set FTDAR to H'00
(Specify H'FFBC00 as
download destination)
Download erasing program
Initialize erasing program
Set FTDAR to H'01
(Specify H'FFCC00 as
download destination)
Download programming
program
1
Enter RAM emulation mode
and tune data
in on-chip RAM
Cancel RAM emulation mode
Erase relevant block
(execute erasing program)
Set FMPDR to H'FFDC00 to
program relevant block
(execute programming
program)
Confirm operation
Initialize programming
program
1
End ?
No
Yes
End procedure program
Figure 17.72 Sample Procedure of Repeating RAM Emulation, Erasing, and Programming
(Overview)
In the above example, the erasing program and programming program are downloaded to areas
excluding the 4 kbytes (H'FFDC00 to H'FFEC00) from H'FFDC00.
Rev.7.00 Feb. 14, 2007 page 733 of 1108
REJ09B0089-0700