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AT26DF161
10.1.5
10.1.6
WEL Bit
RDY/BSY Bit
The WEL bit indicates the current status of the internal Write Enable Latch. When the WEL bit is
in the logical “0” state, the device will not accept any program, erase, Protect Sector, Unprotect
Sector, or Write Status Register commands. The WEL bit defaults to the logical “0” state after a
device power-up or reset. In addition, the WEL bit will be reset to the logical “0” state automati-
cally under the following conditions:
? Write Disable operation completes successfully
? Write Status Register operation completes successfully or aborts
? Protect Sector operation completes successfully or aborts
? Unprotect Sector operation completes successfully or aborts
? Byte/Page Program operation completes successfully or aborts
? Block Erase operation completes successfully or aborts
? Chip Erase operation completes successfully or aborts
If the WEL bit is in the logical “1” state, it will not be reset to a logical “0” if an operation aborts
due to an incomplete or unrecognized opcode being clocked into the device before the CS pin is
deasserted. In order for the WEL bit to be reset when an operation aborts prematurely, the entire
opcode for a program, erase, Protect Sector, Unprotect Sector, or Write Status Register com-
mand must have been clocked into the device.
The RDY/BSY bit is used to determine whether or not an internal operation, such as a program
or erase, is in progress. To poll the RDY/BSY bit to detect the completion of a program or erase
cycle, new Status Register data must be continually clocked out of the device until the state of
the RDY/BSY bit changes from a logical “1” to a logical “0”.
Figure 10-1. Read Status Register
CS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
SCK
OPCODE
SI
0
0
0
0
0
1
0
1
MSB
STATUS REGISTER DATA
STATUS REGISTER DATA
SO
HIGH-IMPEDANCE
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
10.2
Write Status Register
MSB
MSB
MSB
The Write Status Register command is used to modify the SPRL bit of the Status Register
and/or to perform a Global Protect or Global Unprotect operation. Before the Write Status Regis-
ter command can be issued, the Write Enable command must have been previously issued to
set the WEL bit in the Status Register to a logical “1”.
To issue the Write Status Register command, the CS pin must first be asserted and the opcode
of 01h must be clocked into the device followed by one byte of data. The one byte of data con-
sists of the SPRL bit value, a don't care bit, four data bits to denote whether a Global Protect or
21
3599H–DFLASH–8/09
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