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CAT25010VP2A-GT3 데이터시트(PDF) 7 Page - Catalyst Semiconductor

부품명 CAT25010VP2A-GT3
상세설명  1K/2K/4K SPI Serial CMOS EEPROM
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CAT25010, CAT25020, CAT25040
Doc. No. 1006, Rev. S
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Figure 4. Read Instruction Timing
Figure 5. RDSR Instruction Timing
Note: Dashed Line= mode (1, 1) – ––––
21
22
SCK
SI
SO
0000001
1
BYTE ADDRESS
0123456789
10
12
13
14
15
16
17
18
19
20
D7 D6 D5 D4 D3 D2 D1 D0
*Please check the instruction set table for address
CS
OPCODE
DATA OUT
MSB
HIGH IMPEDANCE
11
A7
A6
A5
A4
A3
A2
A1 A0
X=0 for 25010, 25020 ; X=A8 for 25040
Note: Dashed line = mode (1,1)----
X*
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
to provide clock pulses. The internal address pointer is
automatically incremented to the next higher address
after each byte of data is shifted out. When the highest
address is reached, the address counter rolls over to
0000h allowing the read cycle to be continued indefinitely.
The read operation is terminated by pulling the
CS high.
Read sequece is illustrated in Figure 4.
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. Reading status register
is illustrated in Figure 5.
WRITE Sequence
The CAT25010/20/40 powers up in a Write Disable
state. Prior to any write instructions, the WREN instruction
must be sent to CAT25010/20/40. The device goes into
Write enable state by pulling the
CS low and then
clocking the WREN instruction into CAT25010/20/40.
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
properly set. Also, for a successful write operation the


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