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3-6
You can enable Write Protect for user data (8 kbytes) per page (256 bytes). Write Protect allows to prevent data being destroyed by
authorized writing.
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Scope of Write Protect
The addresses of pages from P0 to P31 are described below.
* (h) means that the value is a hexadecimal number.
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How to enable Write Protect
32 Bits of Write Protect data (4 bytes) of system data (refer to Section 2-2-3) correspond to each page. By rewriting a bit corresponding
to a write-protected page from 0 (disable) into 1 (enable), Write Protect to the page is enabled. To disable Write Protect, rewrite the bit
from 1 into 0.
Relation between bit of write-protected data and page is described below.
P**: Status of Write Protect in page ** (between 0 and 31).
Page
256 Bytes/page
P0
0000-00FF (h)
P1
0100-01FF (h)
P2
0200-02FF (h)
P30
1E00-1EFF (h)
P31
1F00-1FFF (h)
Code
Bit
Description
7
6
5
4
3
2
1
0
A1
P7
P6
P5
P4
P3
P2
P1
P0
Status of Write Pro-
tect
0: Disabled (Default
value)
1: Enabled
A2
P15
P14
P13
P12
P11
P10
P9
P8
A3
P23
P22
P21
P20
P19
P18
P17
P16
A4
P31
P30
P29
P28
P27
P26
P25
P24
Write-Protected Data (4 Bytes)
3-6 Write Protect Function
256 Bytes x 32 pages =
8192 bytes