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CAT25C256S16A-1.8TE13 датащи(PDF) 6 Page - Catalyst Semiconductor

номер детали CAT25C256S16A-1.8TE13
подробное описание детали  128K/256K-Bit SPI Serial CMOS E2PROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
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CAT25C256S16A-1.8TE13 датащи(HTML) 6 Page - Catalyst Semiconductor

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CAT25C128/256
Doc. No. 25088-00 1/01
Status Register Bits
Array Address
Protection
BP1
BPO
Protected
25C128
25C256
0
0
None
None
No Protection
0
1
3000-3FFF
6000-7FFF
Quarter Array Protection
1
0
2000-3FFF
4000-7FFF
Half Array Protection
1
1
0000-3FFF
0000-7FFF
Full Array Protection
BLOCK PROTECTION BITS
Protected
Unprotected
Status
WPEN
WP
WP
WP
WP
WP
WEL
Blocks
Blocks
Register
0
X
0
Protected
Protected
Protected
0
X
1
Protected
Writable
Writable
1
Low
0
Protected
Protected
Protected
1
Low
1
Protected
Writable
Protected
X
High
0
Protected
Protected
Protected
X
High
1
Protected
Writable
Writable
WRITE PROTECT ENABLE OPERATION
76543210
WPEN
X
X
X
BP1
BP0
WEL
RDY
STATUS REGISTER
STATUS REGISTER
The Status Register indicates the status of the device.
The
RDY (Ready) bit indicates whether the CAT25C128/
256 is busy with a write operation. When set to 1 a write
cycle is in progress and when set to 0 the device
indicates it is ready. This bit is read only
The WEL (Write Enable) bit indicates the status of the
write enable latch . 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 WEL bit can only be set by the WREN
instruction and can be reset by the WRDI instruction.
The BPO and BP1 (Block Protect) bits indicate which
blocks are currently protected. These bits are set by the
user issuing the WRSR instruction. The user is allowed
to protect quarter of the memory, half of the memory or
the entire memory by setting these bits. Once protected
the user may only read from the protected portion of the
array. These bits are non-volatile.
The WPEN (Write Protect Enable) is an enable bit for the
WP pin. The WP pin and WPEN bit in the status register
control the programmable hardware write protect fea-
ture. Hardware write protection is enabled when
WP is
low and WPEN bit is set to high. The user cannot write
to the status register (including the block protect bits and
the WPEN bit) and the block protected sections in the
memory array when the chip is hardware write pro-
tected. Only the sections of the memory array that are
not block protected can be written.
Hardware write
protection is disabled when either
WP pin is high or the
WPEN bit is zero.


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