25LC080D MICROCHIP [Microchip Technology], 25LC080D Datasheet - Page 11

• Manufacturer Part Number: 25LC080D
• Description: 8K-256K SPI Serial EEPROM High Temp Family Data Sheet
• Manufacturer: MICROCHIP [Microchip Technology]

3.4
The 25LCXXX contains a write enable latch.
Table 5-1 for the write-protect functionality matrix. This
latch must be set before any write operation will be com-
pleted internally. The WREN instruction will set the latch,
and the WRDI will reset the latch.
FIGURE 3-4:
FIGURE 3-5:
© 2009 Microchip Technology Inc.
Write Enable (WREN) and Write
Disable (WRDI)
WRITE ENABLE SEQUENCE (WREN)
WRITE DISABLE SEQUENCE (WRDI)
SCK
CS
SO
SCK
SI
CS
SO
SI
0
0
0
0
0
1
0
1
See
Preliminary
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
25LCXXX
DS22131C-page 11