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CAT25040LIT3 Datasheet(PDF) 5 Page - Catalyst Semiconductor

Part # CAT25040LIT3
Description  1-Kb, 2-Kb and 4-Kb SPI Serial CMOS EEPROM
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25040LIT3 Datasheet(HTML) 5 Page - Catalyst Semiconductor

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CAT25010, CAT25020, CAT25040
© Catalyst Semiconductor, Inc.
5
Doc. No. MD-1006 Rev. T
Characteristics subject to change without notice
STATUS REGISTER
The Status Register, as shown in Table 2, contains a
number of status and control bits.
The RDY
¯¯¯¯ (Ready) bit indicates whether the device is
busy with a write operation. This bit is automatically
set to 1 during an internal write cycle, and reset to 0
when the device is ready to accept commands. For
the host, this bit is read only.
The WEL (Write Enable Latch) bit is set/reset by the
WREN/WRDI commands. When set to 1, the device is
in a Write Enable state and when set to 0, the device
is in a Write Disable state.
The BP0 and BP1 (Block Protect) bits determine
which blocks are currently write protected. They are
set by the user with the WRSR command and are
non-volatile. The user is allowed to protect a quarter,
one half or the entire memory, by setting these bits
according to Table 3. The protected blocks then
become read-only.
Table 2. Status Register
7
6
5
4
3
2
1
0
1
1
1
1
BP1
BP0
WEL
RDY
¯¯¯¯
Table 3. Block Protection Bits
Status Register Bits
BP1
BP0
Array Address Protected
Protection
0
0
None
No Protection
0
1
CAT25010: 060-07F
CAT25020: 0C0-0FF
CAT25040: 180-1FF
Quarter Array Protection
1
0
CAT25010: 040-07F
CAT25020: 080-0FF
CAT25040: 100-1FF
Half Array Protection
1
1
CAT25010: 000-07F
CAT25020: 000-0FF
CAT25040: 000-1FF
Full Array Protection


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