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CAT25080 Datasheet(Hoja de datos) 6 Page - Catalyst Semiconductor

No. de Pieza. CAT25080
Descripción  8-Kb and 16-Kb SPI Serial CMOS EEPROM
Descarga  17 Pages
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Fabricante  CATALYST [Catalyst Semiconductor]
Página de inicio  http://www.catalyst-semiconductor.com
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 6 page
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CAT25080, CAT25160
Doc. No. 1122 Rev. A
6
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
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 2. The WREN
instruction must be sent prior any WRITE or WRSR
instruction.
The internal write enable latch is reset by sending the
WRDI instruction as shown in Figure 3. Disabling write
operations by resetting the WEL bit, will protect the
device against inadvertent writes.
Figure 2. WREN Timing
Note:
Dashed Line = mode (1, 1) - - - - - -
Figure 3. WRDI Timing
Note:
Dashed Line = mode (1, 1) - - - - - -
SCK
SI
CS
SO
000
0
0
11
0
HIGH IMPEDANCE
SCK
SI
CS
SO
0
0
000
10
0
HIGH IMPEDANCE




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