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CAT25020VET3 Arkusz danych(PDF) 7 Page - Catalyst Semiconductor

Numer części CAT25020VET3
Szczegółowy opis  1-Kb, 2-Kb and 4-Kb SPI Serial CMOS EEPROM
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Producent  CATALYST [Catalyst Semiconductor]
Strona internetowa  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25020VET3 Arkusz danych(HTML) 7 Page - Catalyst Semiconductor

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CAT25010, CAT25020, CAT25040
© Catalyst Semiconductor, Inc.
7
Doc. No. MD-1006 Rev. T
Characteristics subject to change without notice
Byte Write
Once the WEL bit is set, the user may execute a write
sequence, by sending a WRITE instruction, a 8-bit
address and data as shown in Figure 4. For the
CAT25040, bit 3 of the write instruction opcode
contains A8 address bit. Internal programming will
start after the low to high CS
¯¯ transition. During an
internal write cycle, all commands, except for RDSR
(Read Status Register) will be ignored. The RDY
¯¯¯¯ bit
will indicate if the internal write cycle is in progress
(RDY
¯¯¯¯ high), or the the device is ready to accept
commands (RDY
¯¯¯¯ low).
Page Write
After
sending
the
first
data
byte
to
the
CAT25010/20/40, the host may continue sending
data, up to a total of 16 bytes, according to timing
shown in Figure 5. After each data byte, the lower
order address bits are automatically incremented,
while the higher order address bits (page address)
remain unchanged. If during this process the end of
page is exceeded, then loading will “roll over” to the
first byte in the page, thus possibly overwriting
previoualy loaded data. Following completion of the
write cycle, the CAT25010/20/40 is automatically
returned to the write disable state.
Figure 4. Byte WRITE Timing
Notes:
Dashed Line = mode (1, 1) - - - - - -
* X = 0 for CAT25010, CAT25020. x = A8 for CAT25040
Figure 5. Page WRITE Timing
Notes:
Dashed Line = mode (1, 1) - - - - - -
* X = 0 for CAT25010, CAT25020. x = A8 for CAT25040
SCK
SI
SO
00
0
0
X*
0
1
0
D7 D6 D5 D4 D3 D2 D1 D0
012345678
CS
OPCODE
DATA IN
HIGH IMPEDANCE
BYTE ADDRESS
A7
A0
13
14 15
16
17
18 19
20
21
22 23
SCK
SI
SO
00
00
X*
0
1
0
BYTE ADDRESS
Data
Byte 1
01234
5678
13
14
15 16-23 24-31
Data
Byte 2
Data
Byte 3
Data Byte N
CS
OPCODE
7..1
0
16+(N-1)x8-1..16+(N-1)x8 16+Nx8-1
DATA IN
HIGH IMPEDANCE
A7
A0


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