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CAT25256VE.GT3 数据表(PDF) 9 Page - ON Semiconductor

部件名 CAT25256VE.GT3
功能描述  256-Kb SPI Serial CMOS EEPROM
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

CAT25256VE.GT3 数据表(HTML) 9 Page - ON Semiconductor

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CAT25256
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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 15 significant address
bits are used by the CAT25256. The 16th address bit is don’t
care, 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 CAT25256, 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 CAT25256 is
automatically returned to the write disable state. While the
internal write cycle is in progress, the RDSR command will
output the RDY (Ready) bit status only (i.e., data out = FFh).
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
A14 − A0
A15
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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