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CAT25C04LITE13 データシート(PDF) 6 Page - Catalyst Semiconductor

部品番号 CAT25C04LITE13
部品情報  1K/2K/4K SPI Serial CMOS EEPROM
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メーカー  CATALYST [Catalyst Semiconductor]
ホームページ  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25C04LITE13 データシート(HTML) 6 Page - Catalyst Semiconductor

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Discontinued
Parts
6
CAT25C01, CAT25C02, CAT25C04
Doc. No. 1105, Rev. B
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Figure 2. WREN Instruction Timing
Figure 3. WRDI Instruction Timing
SCK
SI
CS
SO
Note: Dashed Line = mode (1, 1)
00000
11
0
HIGH IMPEDANCE
SCK
SI
CS
SO
00000
10
0
HIGH IMPEDANCE
Note: Dashed Line = mode (1, 1)
STATUS REGISTER
The Status Register indicates the status of the device.
The
RDY (Ready) bit indicates whether the CAT25C01/
02/04 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 BP0 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
protected. 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.
DEVICE OPERATION
Write Enable and Disable
The CAT25C01/02/04 contains a write enable latch.
This latch must be set before any write operation. The
device powers up in a write disable state when VCC is
applied. WREN instruction will enable writes (set the
latch) to the device. WRDI instruction will disable writes
(reset the latch) to the device. Disabling writes will
protect the device against inadvertent writes.
READ Sequence
The part is selected by pulling
CS low. The 8-bit read
instruction is transmitted to the CAT25C01/02/04,
followed by the 8-bit address for CAT25C01/02/04 (for
the CAT25C04, bit 3 of the read data instruction contains
address A8).


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