Datasheet

READ REGISTER and WRITE REGISTER Operations
READ STATUS REGISTER or FLAG STATUS REGISTER Command
To initiate a READ STATUS REGISTER command, S# is driven LOW. For extended SPI
protocol, the command code is input on DQ0, and output on DQ1. For dual SPI proto-
col, the command code is input on DQ[1:0], and output on DQ[1:0]. For quad SPI proto-
col, the command code is input on DQ[3:0], and is output on DQ[3:0]. The operation is
terminated by driving S# HIGH at any time during data output.
The status register can be read continuously and at any time, including during a PRO-
GRAM, ERASE, or WRITE operation.
The flag status register can be read continuously and at any time, including during an
ERASE or WRITE operation.
If one of these operations is in progress, checking the write in progress bit or P/E con-
troller bit is recommended before executing the command.
Figure 10: READ REGISTER Command
High-Z
DQ1
7 8
9
10
11
12
13
14
15
0
C
MSB
DQ0
LSB
Command
3 4 5 6 7
0
C
MSB
DQ[1:0]
LSB
Command
MSB
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
LSB
Extended
MSB
D
OUT
D
OUT
D
OUT
D
OUT
D
OUT
LSB
D
OUT
D
OUT
D
OUT
D
OUT
Dual
Quad
1 2 3
0
C
MSB
DQ[3:0]
LSB
Command
MSB
D
OUT
D
OUT
D
OUT
LSB
Don’t Care
Notes:
1. Supports all READ REGISTER commands except READ LOCK REGISTER.
2. A READ NONVOLATILE CONFIGURATION REGISTER operation will output data starting
from the least significant byte.
READ NONVOLATILE CONFIGURATION REGISTER Command
To execute a READ NONVOLATILE CONFIGURATION REGISTER command, S# is driv-
en LOW. For extended SPI protocol, the command code is input on DQ0, and output on
DQ1. For dual SPI protocol, the command code is input on DQ[1:0], and output on
DQ[1:0]. For quad SPI protocol, the command code is input on DQ[3:0], and is output
3V, 256Mb: Multiple I/O Serial Flash Memory
READ REGISTER and WRITE REGISTER Operations
09005aef84566603
n25q_256mb_65nm.pdf - Rev. W 11/16 EN
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