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CAT25160LI-G 데이터시트(PDF) 7 Page - ON Semiconductor

부품명 CAT25160LI-G
상세설명  8-Kb and 16-Kb SPI Serial CMOS EEPROM
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT25160LI-G 데이터시트(HTML) 7 Page - ON Semiconductor

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CAT25080, CAT25160
http://onsemi.com
7
WRITE OPERATIONS
The CAT25080/160 device powers up into a write disable
state. The device contains a Write Enable Latch (WEL)
which must be set before attempting to write to the memory
array or to the status register. In addition, the address of the
memory location(s) to be written must be outside the
protected area, as defined by BP0 and BP1 bits from the
status register.
Write Enable and Write Disable
The internal Write Enable Latch and the corresponding
Status Register WEL bit are set by sending the WREN
instruction to the CAT25080/160. Care must be taken to take
the CS input high after the WREN instruction, as otherwise
the Write Enable Latch will not be properly set. WREN
timing is illustrated in Figure 3. The WREN instruction must
be sent prior to any WRITE or WRSR instruction.
The internal write enable latch is reset by sending the
WRDI instruction as shown in Figure 4. Disabling write
operations by resetting the WEL bit, will protect the device
against inadvertent writes.
Figure 3. WREN Timing
SCK
SI
SO
00
0
0
0
11
0
HIGH IMPEDANCE
Dashed Line = mode (1, 1)
CS
Figure 4. WRDI Timing
SCK
SI
SO
0
0
000
10
0
HIGH IMPEDANCE
Dashed Line = mode (1, 1)
CS


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