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CAT25C256Y20-GT2 датащи(PDF) 8 Page - Catalyst Semiconductor

номер детали CAT25C256Y20-GT2
подробное описание детали  128K/256K-Bit SPI Serial CMOS EEPROM
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
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CAT25C256Y20-GT2 датащи(HTML) 8 Page - Catalyst Semiconductor

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CAT25C128/256
8
Document No. 1018, Rev. I
properly set. Also, for a successful write operation the
address of the memory location(s) to be programmed
must be outside the protected address field location
selected by the block protection level.
Byte Write
Once the device is in a Write Enable state, the user may
proceed with a write sequence by setting the
CS low,
issuing a write instruction via the SI line, followed by the
16-bit address (the three Most Significant Bits are don’t
care for 25C256 and four most significant bits are don't
care for 25C128), and then the data to be written.
Programming will start after the
CS is brought high. Figure
6 illustrates byte write sequence.
During an internal write cycle, all commands will be
ignored except the RDSR (Read Status Register)
instruction.
To read the status register, RDSR instruction should be
sent. The contents of the status register are shifted out
on the SO line. The status register may be read at any
time even during a write cycle. Read sequece is illus-
trated in Figure 4. Reading status register is illustrated in
Figure 5.
WRITE Sequence
The CAT25C128/256 powers up in a Write Disable
state. Prior to any write instructions, the WREN instruc-
tion must be sent to CAT25C128/256. The device goes
into Write enable state by pulling the
CS low and then
clocking the WREN instruction into CAT25C128/256.
The
CS must be brought high after the WREN instruction
to enable writes to the device. If the write operation is
initiated immediately after the WREN instruction without
CS being brought high, the data will not be written to the
array because the write enable latch will not have been
SK
SI
SO
0000001
1
BYTE ADDRESS*
0123456789
10
20
21
22
23
24
25
26
27
28
29
30
7
6
5
4
3
2
1
0
*Please check the instruction set table for address
CS
OPCODE
DATA OUT
MSB
HIGH IMPEDANCE
Note: Dashed Line= mode (1, 1) — ———
Figure 4. Read Instruction Timing
Figure 5. RDSR Timing
0
1
2
345
67
8
10
911
12
13
14
SCK
SI
DATA OUT
MSB
HIGH IMPEDANCE
OPCODE
SO
7
6
5
4
3
2
1
0
CS
00
0
00
1
0
1
Note: Dashed Line= mode (1, 1) — ———


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