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AT25010/020/040
WRITE ENABLE (WREN): The device will power up in the write disable state when V CC
is applied. All programming instructions must therefore be preceded by a Write Enable
instruction. The WP pin must be held high during a WREN instruction.
WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the Write
Disable instruction disables all programming modes. The WRDI instruction is indepen-
dent of the status of the WP pin.
READ STATUS REGISTER (RDSR): The Read Status Register instruction provides
access to the status register. The READY/BUSY and Write Enable status of the device
can be determined by the RDSR instruction. Similarly, the Block Write Protection bits
indicate the extent of protection employed. These bits are set by using the WRSR
instruction.
Table 2. Status Register Format
Bit 7
X
Bit 6
X
Bit 5
X
Bit 4
X
Bit 3
BP1
Bit 2
BP0
Bit 1
WEN
Bit 0
RDY
Table 3. Read Status Register Bit Definition
Bit
Bit 0 (RDY)
Bit 1 (WEN)
Bit 2 (BP0)
Bit 3 (BP1)
Definition
Bit 0 = 0 (RDY) indicates the device is READY. Bit 0 = 1 indicates the
write cycle is in progress.
Bit 1 = 0 indicates the device is not WRITE ENABLED. Bit 1 = 1 indicates
the device is WRITE ENABLED.
See Table 4.
See Table 4.
Bits 4-7 are 0s when device is not in an internal write cycle.
Bits 0-7 are 1s during an internal write cycle.
WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select
one of four levels of protection. The AT25010/020/040 is divided into four array seg-
ments. Top quarter (1/4), Top half (1/2), or all of the memory segments can be
protected. Any of the data within any selected segment will therefore be READ only. The
block write protection levels and corresponding status register control bits are shown in
Table 4.
The two bits, BP1 and BP0 are nonvolatile cells that have the same properties and func-
tions as the regular memory cells (e.g. WREN, t WC , RDSR).
Table 4. Block Write Protect Bits
Status Register Bits
Array Addresses Protected
Level
0
1 (1/4)
2 (1/2)
3 (All)
BP1
0
0
1
1
BP0
0
1
0
1
AT25010
None
60-7F
40-7F
00-7F
AT25020
None
C0-FF
80-FF
00-FF
AT25040
None
180-1FF
100-1FF
000-1FF
7
0606M–SEEPR–06/03
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