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CAT25M02C8ATR データシート(PDF) 10 Page - ON Semiconductor

部品番号 CAT25M02C8ATR
部品情報  2 Mb SPI Serial CMOS EEPROM
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT25M02C8ATR データシート(HTML) 10 Page - ON Semiconductor

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CAT25M02
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10
Read Operations
Read from Memory Array
To read from memory, the host sends a READ instruction
followed by a 24−bit address (see Table 10 for the number
of significant address bits).
After receiving the last address bit, the CAT25M02 will
respond by shifting out data on the SO pin (as shown in
Figure 9). Sequentially stored data can be read out by simply
continuing to run the clock. The internal address pointer is
automatically incremented to the next higher address as data
is shifted out. After reaching the highest memory address,
the address counter “rolls over” to the lowest memory
address, and the read cycle can be continued indefinitely.
The read operation is terminated by taking CS high.
Read Identification Page
Reading the additional 256-byte Identification Page (IP)
is achieved using the same Read command sequence as used
for Read from main memory array (Figure 10). The IPL bit
from the Status Register must be set (IPL = 1) before
attempting to read from the IP. The [A7:A0] are the address
significant bits that point to the data byte shifted out on the
SO pin. If the CS continues to be held low, the internal
address register defined by [A7:A0] bits is automatically
incremented and the next data byte from the IP is shifted out.
The byte address must not exceed the 256-byte page
boundary.
Read Status Register
To read the status register, the host simply sends a RDSR
command. After receiving the last bit of the command, the
CAT25M02 will shift out the contents of the status register
on the SO pin (Figure 10). The status register may be read
at any time, including during an internal write cycle.
SCK
SI
SO
0
000
00
1
1
BYTE ADDRESS*
01
234
5678
9
10
28
29
30
31
32
33
34
35
36
37
38
7
6
5
4
3
2
1
0
DATA OUT
MSB
HIGH IMPEDANCE
OPCODE
Figure 9. READ Timing
Note: Dashed Line = mode (1, 1)
A0
AN
* Please check the Byte Address Table (Table 10)
CS
Figure 10. RDSR Timing
01
2
3
4
5
6
7
8
10
911
12
13
14
SCK
SI
DATA OUT
MSB
HIGH IMPEDANCE
OPCODE
SO
7
6
5
4
3
2
1
0
00
0
0
0
1
0
1
Note: Dashed Line = mode (1, 1)
CS


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