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CAT25640YI-GT3 データシート(PDF) 8 Page - Catalyst Semiconductor

部品番号 CAT25640YI-GT3
部品情報  64-Kb SPI Serial CMOS EEPROM
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メーカー  CATALYST [Catalyst Semiconductor]
ホームページ  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT25640YI-GT3 データシート(HTML) 8 Page - Catalyst Semiconductor

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CAT25640
Doc. No. MD-1128 Rev. B
8
© 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 6. Only
bits 2, 3 and 7 can be written using the WRSR
command.
Write Protection
The Write Protect (WP
¯¯¯) pin can be used to protect the
Block Protect bits BP0 and BP1 against being
inadvertently altered. When WP
¯¯¯ is low and the WPEN
bit is set to “1”, write operations to the Status Register
are inhibited. WP
¯¯¯ going low while CS
¯¯ is still low will
interrupt a write to the status register. If the internal
write cycle has already been initiated, WP
¯¯¯ going low
will have no effect on any write operation to the Status
Register. The WP
¯¯¯ pin function is blocked when the
WPEN bit is set to “0”. The WP
¯¯¯ input timing is shown
in Figure 7.
Figure 6. WRSR Timing
Note:
Dashed Line = mode (1, 1) - - - - - -
Figure 7. 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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