CAT25020 Catalyst Semiconductor, CAT25020 Datasheet - Page 8

• Manufacturer Part Number: CAT25020
• Description: 2k Spi Serial Cmos Eeprom
• Manufacturer: Catalyst Semiconductor

CAT25010, CAT25020, CAT25040
Write Status Register
The Status Register is written by sending a WRSR
instruction according to timing shown in Figure 6. Only
bits 2 and 3 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. MD-1006 Rev. T
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
8
1
7
t WP S
Write Protection
When WP
memory array and Status Register are inhibited. WP
going low while CS
the status register. If the internal write cycle has
already been initiated, WP
effect on any write operation to the Status Register.
The WP
MSB
7
8
¯¯¯ input timing is shown in Figure 7.
t WPH
¯¯¯ input is low all write operations to the
9
6
10
5
¯¯ is still low will interrupt a write to
11
4
DATA IN
12
¯¯¯ going low will have no
3
Characteristics subject to change without notice
13
2
14
© Catalyst Semiconductor, Inc.
1
15
0
¯¯¯