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Giải thích chi tiết về linh kiện  2-Mbit DataFlash (with Extra 64 kbits) 1.65 V Minimum SPI Serial Flash Memory
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AT45DB021E
DS-AT45DB021E—8789J—03/2021
Table 8-3.
WP Pin and Protection Status
8.3
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 eight bytes of
data, of which byte locations 0 through 7 contain values that specify whether Sectors 0 through 7 are protected or
unprotected. The Sector Protection Register is user modifiable and must be erased before it can be
reprogrammed. Table 8-4 illustrates the format of the Sector Protection Register.
Table 8-4.
Sector Protection Register
Note:
The default values for bytes 0 through 7 are 00h when shipped from Adesto.
Table 8-5.
Sector 0 (0a, 0b) Sector Protection Register Byte Value
Note:
X = Don’t care.
Time
Period
WP Pin
Enable Sector Protection Command
Disable Sector
Protection Command
Sector
Protection
Status
Sector
Protection
Register
1
High
Command Not Issued Previously
X
Disabled
Read/Write
—
Issue Command
Disabled
Read/Write
Issue Command
—
Enabled
Read/Write
2
Low
X
X
Enabled
Read
3
High
Command Issued During Period 1 or 2
Not Issued Yet
Enabled
Read/Write
—
Issue Command
Disabled
Read/Write
Issue Command
—
Enabled
Read/Write
Sector Number
0 (0a, 0b)
1 to 7
Protected
See
Table 8-5
FFh
Unprotected
00h
Sector Protect/Unprotect
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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