r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 957

• Manufacturer Part Number: r5f71374an80fpv
• Description: 32-bit Risc Microcomputer Superh?? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

(3.6) After erasure finishes, clear FKEY and specify software protection.
(4) Erasing and Programming Procedure in User Program Mode
• Be careful not to destroy on-chip RAM with overlapped settings.
Figure 22.13 Sample Procedure of Repeating RAM Emulation, Erasing, and Programming
If this LSI is restarted by a power-on reset immediately after user MAT erasing has finished,
secure a reset period (period of RES = 0) that is at least as long as the normal 100 µs.
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 22.13 shows an example of repetitively executing RAM emulation, erasing, and
programming.
In the above example, the erasing program and programming program are downloaded to areas
excluding addresses (H'FFFFA000 to H'FFFFAFFF) to execute RAM emulation.
Download and initialization are performed only once at the beginning.
In this kind of operation, note the following:
Download erasing program
Initialize erasing program
(Specify H'FFFFB000 as
(Specify H'FFFF9000 as
Start procedure program
Download programming
Initialize programming
download destination)
download destination)
Set FTDAR to H'00
Set FTDAR to H'04
program
program
1
(Overview)
Enter RAM emulation mode and
(execute programming program)
Rev. 1.00 Sep. 21, 2007 Page 931 of 1124
Set FMPDR to H'FFFFA000 to
Cancel RAM emulation mode
(execute erasing program)
tune data in on-chip RAM
End procedure program
program relevant block
Erase relevant block
Confirm operation
End?
1
Yes
Section 22 Flash Memory
REJ09B0402-0100
No