25C320-E/ST MICROCHIP [Microchip Technology], 25C320-E/ST Datasheet - Page 12

• Manufacturer Part Number: 25C320-E/ST
• Description: 32K SPI Bus Serial EEPROM
• Manufacturer: MICROCHIP [Microchip Technology]

25AA320/25LC320/25C320
3.7
The following protection has been implemented to
prevent inadvertent writes to the array:
• The write enable latch is reset on power-up
• A WRITE ENABLE instruction must be issued to
• After a byte write, page write or STATUS register
• CS must be set high after the proper number of
• Access to the array during an internal write cycle
TABLE 3-3:
DS21227F-page 12
set the write enable latch
write, the write enable latch is reset
clock cycles to start an internal write cycle
is ignored and programming is continued
WPEN
x
0
1
x
Data Protection
WRITE-PROTECT FUNCTIONALITY MATRIX
High
Low
WP
x
x
WEL
0
1
1
1
Protected Blocks
Protected
Protected
Protected
Protected
3.8
The 25XX320 powers on in the following state:
• The device is in low-power Standby mode
• The write enable latch is reset
• SO is in high-impedance state
• A low level on CS is required to enter active state
.
(CS =
1
Unprotected Blocks
Power-On State
)
Protected
Writable
Writable
Writable
© 2008 Microchip Technology Inc.
STATUS Register
Protected
Protected
Writable
Writable