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CAT15002 Datasheet(PDF) 10 Page - Catalyst Semiconductor

Part No. CAT15002
Description  Voltage Supervisor with 2-Kb and 4-Kb SPI Serial CMOS EEPROM
Download  15 Pages
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT15002 Datasheet(HTML) 10 Page - Catalyst Semiconductor

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CAT15002, CAT15004
Doc. No. 1126 Rev. A
10
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Write Status Register
The Status Register is written by sending a WRSR
instruction according to timing shown in Figure 8.
Only bits 2 and 3 can be written using the WRSR
command.
Write Protection
The Write Protect (WP
¯¯¯) pin can be used to disable all
write operations when held low. WP
¯¯¯ going low while
CS
¯¯
is still low will interrupt a write to the
CAT15002/04. If the internal write cycle has already
been initiated, WP
¯¯¯ going low will have no effect on any
write operation. The WP
¯¯¯ input timing is shown in
Figure 9.
Figure 8. WRSR Timing
Note: Dashed Line = mode (1, 1) - - - - - -
Figure 9. WP
¯¯¯ Timing
Note: Dashed Line = mode (1, 1) - - - - - -
01
2
3
4
5
6
78
10
911
12
13
14
SCK
SI
MSB
HIGH IMPEDANCE
DATA IN
15
SO
CS
7
6
5
4
3
2
10
00
0
0
0
0
0
1
OPCODE
CS
SCK
WP
WP
t WPS
t WPH


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