CAT25M01 ONSEMI [ON Semiconductor], CAT25M01 Datasheet - Page 8

• Manufacturer Part Number: CAT25M01
• Description: 1 Mb SPI Serial CMOS EEPROM
• Manufacturer: ONSEMI [ON Semiconductor]

Write Status Register
instruction according to timing shown in Figure 7. Only bits
2, 3, 4, 6 and 7 can be written using the WRSR command.
SCK
SO
The Status Register is written by sending a WRSR
CS
SI
SCK
Note: Dashed Line = mode (1, 1)
Note: Dashed Line = mode (1, 1)
WP
WP
CS
0
0
0
1
HIGH IMPEDANCE
0
2
0
3
OPCODE
0
4
0
5
Figure 7. WRSR Timing
0
Figure 8. WP Timing
6
http://onsemi.com
1
7
8
t
MSB
WPS
8
7
Write Protection
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 8.
The Write Protect (WP) pin can be used to protect the
t
9
6
WPH
10
5
11
4
DATA IN
12
3
13
2
14
1
15
0