CAT25080 CATALYST [Catalyst Semiconductor], CAT25080 Datasheet - Page 8

• Manufacturer Part Number: CAT25080
• Description: 8-Kb and 16-Kb SPI Serial CMOS EEPROM
• Manufacturer: CATALYST [Catalyst Semiconductor]

CAT25080, CAT25160
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.
Figure 6. WRSR Timing
Note: Dashed Line = mode (1, 1) - - - - - -
Figure 7. WP
Note: Dashed Line = mode (1, 1) - - - - - -
Doc. No. 1122 Rev. A
SCK
CS
SCK
SO
SI
CS
WP
WP
¯¯¯ Timing
0
0
0
1
HIGH IMPEDANCE
0
2
0
3
OPCODE
0
4
0
5
0
6
1
7
t WP S
8
MSB
Write Protection
The Write Protect (WP
Block Protect bits BP0 and BP1 against being
inadvertently altered. When WP
bit is set to “1”, write operations to the Status Register
are inhibited. WP
interrupt a write to the status register. If the internal
write cycle has already been initiated, WP
have no effect on any write operation to the Status
Register. The WP
WPEN bit is set to “0”. The WP
Figure 7.
8
7
t WPH
9
6
10
5
¯¯¯ going low while CS
¯¯¯ pin function is blocked when the
11
4
DATA IN
¯¯¯ ) pin can be used to protect the
12
3
Characteristics subject to change without notice
¯¯¯ input timing is shown in
13
¯¯¯ is low and the WPEN
2
14
© 2006 Catalyst Semiconductor, Inc.
1
¯¯ is still low will
¯¯¯ going low will
15
0