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CAT25C65PE-TE13 датащи(PDF) 6 Page - Catalyst Semiconductor

номер детали CAT25C65PE-TE13
подробное описание детали  32K/64K-Bit SPI Serial CMOS EEPROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

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CAT25C33/65
Doc. No. 1000, Rev. F
Figure 2. WREN Instruction Timing
Figure 3. WRDI Instruction Timing
Note: Dashed Line= mode (1, 1) — — — —
Note: Dashed Line= mode (1, 1) — — — —
SK
SI
CS
SO
00000
11
0
HIGH IMPEDANCE
SK
SI
CS
SO
00000
10
0
HIGH IMPEDANCE
directly to Vcc or tied to Vcc through a resistor. Figure
9 illustrates hold timing sequence.
STATUS REGISTER
The Status Register indicates the status of the device.
The
RDY (Ready) bit indicates whether the CAT25C33/
65 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, BP1 and BP2 (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 any quarter of the memory, the
lower half of the memory, the first page or the last page 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 feature.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 thememory 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 CAT25C33/65 contains a write enable latch. This latch
must be set before any write operation. The device powers


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