25LC080 MICROCHIP [Microchip Technology], 25LC080 Datasheet - Page 9

• Manufacturer Part Number: 25LC080
• Description: 8K SPI TM Bus Serial EEPROM
• Manufacturer: MICROCHIP [Microchip Technology]

3.4
The 25XX080 contains a write enable latch.
Table 3-3 for the Write-Protect Functionality Matrix.
This latch must be set before any write operation will be
completed internally. The WREN instruction will set the
latch, and the WRDI will reset the latch.
FIGURE 3-4:
FIGURE 3-5:
 2004 Microchip Technology Inc.
Write Enable (WREN) and Write
Disable (WRDI)
WRITE ENABLE SEQUENCE
WRITE DISABLE SEQUENCE
SCK
CS
SO
SCK
SI
CS
SO
SI
0
0
0
0
0
1
0
1
25AA080/25LC080/25C080
See
High-impedance
0
High-impedance
0
2
2
0
0
3
3
The following is a list of conditions under which the
write enable latch will be reset:
• Power-up
• WRDI instruction successfully executed
• WRSR instruction successfully executed
• WRITE instruction successfully executed
0
0
4
4
1
5
1
5
1
6
1 0
6
0
7
0
7
DS21230D-page 9