N25S818HA Datasheet, PDF (11/15 Pages) ON Semiconductor – 256Kb Low Power Serial SRAMs 32K × 8 bit Organization

N25S0818HA
WRITE Status Register Instruction (WRSR)
This instruction provides the ability to write the status register and select among several operating modes.
Several of the register bits must be set to a low ‘0’ if any of the other bits are written. The timing sequence
to write to the status register is shown below, followed by the organization of the status register.
WRITE Status Register Sequence
CS
SCK
SI
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Instruction
Status Register Data In
0000000176543210
SO
High-Z
Status Register
Bit 7 Bit 6
Bit 5
Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
Mode
0 0 = Word Mode
(Default)
1 0 = Page Mode
0 1 = Burst Mode
1 1 = Reserved
Reserved
Must = 0
Reserved
Must = 0
Hold Function
0 = Hold (Default)
1 = No Hold
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