RL78/F13, F14 CHAPTER 30 FLASH MEMORY
R01UH0368EJ0210 Rev.2.10 1642
Dec 10, 2015
30.6.3 Flash shield window function
The flash shield window function is provided as one of the security functions for self programming. It disables writing to
and erasing areas outside the range specified as a window only during self programming.
The window range can be set by specifying the start and end blocks. The window range can be set or changed during
both serial programming and self-programming.
Writing to and erasing areas outside the window range are disabled during self programming. During serial programming,
however, areas outside the range specified as a window can be written and erased.
Figure 30-11. Flash Shield Window Setting Example
(Target Devices: R5F10BLE, Start Block: 04H, End Block: 06H)
Cautions 1. If the rewrite-prohibited area of the boot cluster 0 overlaps with the flash shield window range,
prohibition to rewrite the boot cluster 0 takes priority.
2. The flash shield window can only be used for the code flash memory (and is not supported for
the data flash memory).
Table 30-11. Relationship between Flash Shield Window Function Setting/Change Methods and Commands
Programming conditions
Window Range
Setting/Change Methods
Execution Commands
Block erase Write
Self-programming
Specify the starting and
ending blocks by the
flash self programming
library.
Block erasing is enabled
only within the window
range.
Writing is enabled only
within the range of
window range.
Serial programming
Specify the starting and
ending blocks on GUI of
dedicated flash memory
programmer, etc.
Block erasing is enabled
also outside the window
range.
Writing is enabled also
outside the window
range.
Remark See 30.7 Security Settings to prohibit writing or erasing during serial programming.
Block 00H
Block 01H
Block 02H
Block 03H
Block 05H
Block 06H
(end block)
Block 04H
(start block)
Block 3FH
Block 3EH
√ : Serial programming
x : Self programming
√ : Serial programming
√ : Self programming
√ : Serial programming
x : Self programming
Flash memory
area
Flash shield
range
Window range
Flash shield
range
0FFFFH
01C00H
01BFFH
01000H
00FFFH
00000H
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