R01UH0822EJ0100 Rev.1.00
Page 931 of 1041
Jul 31, 2019
RX13T Group
31. Flash Memory (FLASH)
31.6
Area Protection
Area protection enables rewriting only the selected blocks (access window) in the user area and disables rewriting the
other blocks during self-programming. The access window cannot be set in the data area.
Specify the start address and end address to set the access window. While the access window can be set in boot mode or
by self-programming, area protection is enabled only during self-programming in single-chip mode.
shows the Area Protection Overview (When Blocks 4 to 6 are Set as the Access Window in Products with
Figure 31.4
Area Protection Overview (When Blocks 4 to 6 are Set as the Access Window in Products with
128-Kbyte ROM)
Block 4
Block 3
Block 2
Block 1
Block 0
Block 6
Block 5
Access window
Enabled
Disabled
Disabled
Address for
reading
Rewrite by
self-programming
Rewrite in
boot mode
Enabled
Address for
programming/erasure
Access window
start address
Access window
end address
FFFE 0000h
FFFF FFFFh
FFFF E3FFh
FFFF E400h
FFFF EFFFh
FFFF F000h
6 0000h
7 E3FFh
7 E400h
7 EFFFh
7 F000h
7 FFFFh
Block 127
Block 126