Renesas RL78/G1D User Manual

RL78/G13 CHAPTER 25 FLASH MEMORY
R01UH0146EJ0100 Rev.1.00 951
Sep 22, 2011
25.7.2 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 on-board/off-board programming and self programming.
Writing to and erasing areas outside the window range are disabled during self programming. During on-board/off-
board programming, however, areas outside the range specified as a window can be written and erased.
Figure 25-13. Flash Shield Window Setting Example
(Target Devices: R5F100LE, Start Block: 04H, End Block: 06H)
Block 00H
Block 01H
Block 02H
Block 03H
Block 05H
Block 06H
(end block)
Block
04H
(start block)
Block
3FH
Block 3EH
√: On-board/off-board programming
×: Self programming
√: On-board/off-board programming
√: Self programming
√: On-board/off-board programming
×: Self programming
Flash memory
area
Flash shield
range
Methods by which writing can be performed
Window range
Flash shield
range
0FFFFH
01C00H
01BFFH
01000H
00FFFH
00000H
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 25-14. Relationship between Flash Shield Window Function Setting/Change Methods and Commands
Execution Commands Programming conditions
Window Range
Setting/Change Methods
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.
On-board/Off-board
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 25.6 Security Settings to prohibit writing/erasing during on-board/off-board programming.
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Renesas RL78/G1D Specifications

General

Brand	Renesas
Model	RL78/G1D
Category	Computer Hardware
Language	English