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CAT25128YI.G Datasheet(PDF) 9 Page - ON Semiconductor

No. de pieza CAT25128YI.G
Descripción Electrónicos  128-Kb SPI Serial CMOS EEPROM
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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CAT25128YI.G Datasheet(HTML) 9 Page - ON Semiconductor

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CAT25128
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9
Byte Write
Once the WEL bit is set, the user may execute a write
sequence, by sending a WRITE instruction, a 16−bit address
and data as shown in Figure 5. Only 14 significant address
bits are used by the CAT25128. The rest are don’t care bits,
as shown in Table 14. 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 device is ready to
accept commands (RDY low).
Page Write
After sending the first data byte to the CAT25128, the host
may continue sending data, up to a total of 64 bytes,
according to timing shown in Figure 6. 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 previously loaded data.
Following completion of the write cycle, the CAT25128 is
automatically returned to the write disable state.
Write Identification Page
The additional 64−byte Identification Page (IP) can be
written with user data using the same Write commands
sequence as used for Page Write to the main memory array
(Figure 6). The IPL bit from the Status Register must be set
(IPL = 1) using the WRSR instruction, before attempting
to write to the IP.
The address bits [A15:A6] are Don’t Care and the
[A5:A0] bits define the byte address within the
Identification Page. In addition, the Byte Address must point
to a location outside the protected area defined by the BP1,
BP0 bits from the Status Register. When the full memory
array is write protected (BP1, BP0 = 1,1), the write
instruction to the IP is not accepted and not executed.
Also, the write to the IP is not accepted if the LIP bit from
the Status Register is set to 1 (the page is locked in
Read−only mode).
Table 14. BYTE ADDRESS
Address Significant Bits
Address Don’t Care Bits
# Address Clock Pulses
Main Memory Array
A13 − A0
A15 − A14
16
Identification Page*
A5 − A0
A15 − A6
16
*New Product only.
Figure 5. Byte WRITE Timing
SCK
SI
SO
00
0
0
0
1
0
D7 D6 D5 D4 D3 D2 D1 D0
012
345
67
8
OPCODE
DATA IN
HIGH IMPEDANCE
BYTE ADDRESS*
21 22 23 24 25 26 27 28 29 30 31
Dashed Line = mode (1, 1)
CS
A0
AN
0
* Please check the Byte Address Table (Table 14)
Figure 6. Page WRITE Timing
SCK
SI
SO
00
00
0
1
0
BYTE ADDRESS*
Data
Byte 1
0123
456
78
21 22 23 24−31 32−39
Data Byte N
OPCODE
7..1
0
24+(N−1)x8−1 .. 24+(N−1)x8
24+Nx8−1
DATA IN
HIGH IMPEDANCE
Dashed Line = mode (1, 1)
CS
AN
A0
Data
Byte 3
Data
Byte 2
0
* Please check the Byte Address Table (Table 14)


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