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AT45DB321E Datasheet(PDF) 29 Page - Renesas Technology Corp

Part # AT45DB321E
Description  32-Mbit DataFlash (with Extra 1-Mbits), 2.3 V Minimum SPI Serial Flash Memory
PDF  80 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

AT45DB321E Datasheet(HTML) 29 Page - Renesas Technology Corp

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DS-AT45DB321E-8784 Rev. N
Page 29
9/1/23
© 2023 Renesas Electronics
AT45DB321E Datasheet
7.16 Sector Protection Register
The nonvolatile Sector Protection Register specifies which sectors are to be protected or unprotected with either
the software or hardware controlled protection methods. The Sector Protection Register contains 64 bytes of data,
of which byte locations 0 through 63 contain values that specify whether Sectors 0 through 63 are protected or
unprotected. The Sector Protection Register is user modifiable and must be erased before it can be
reprogrammed. Table 9 shows the format of the Sector Protection Register.
Table 9. Sector Protection Register
The default values for bytes 0 through 63 are 00h when shipped from Renesas Electronics.
Table 10. Sector 0 (0a, 0b) Sector Protection Register Byte Value
Note: x = Don’t care.
Sector Number
0 (0a, 0b)
1 to 63
Protected
See Table 10
FFh
Unprotected
00h
Bit 7:6
Bit 5:4
Bit 3:2
Bit 1:0
Data
Value
Sector 0a (Page 0-7)
Sector 0b (Page 8-127)
N/A
N/A
Sectors 0a and 0b Unprotected
00
00
XX
XX
0xh
Protect Sector 0a
11
00
XX
XX
Cxh
Protect Sector 0b
00
11
XX
XX
3xh
Protect Sectors 0a and 0b
11
11
XX
XX
Fxh



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