23A640/23K640
2.6
Write Status Register Instruction
( WRSR )
The Write Status Register instruction ( WRSR ) allows the
user to write to the bits in the STATUS register as
shown in Table 2-2. This allows for setting of the Device
operating mode. Several of the bits in the STATUS
register must be cleared to ‘ 0 ’. See Figure 2-8 for the
WRSR timing sequence.
FIGURE 2-8:
CS
WRITE STATUS REGISTER TIMING SEQUENCE ( WRSR )
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
SCK
Instruction
Data to STATUS Register
SI
0
0
0
0
0
0
0
1
7
6
5
4
3
2
1
0
High-Impedance
SO
2.7
Power-On State
The 23X640 powers on in the following state:
? The device is in low-power Standby mode
(CS = 1 )
? A high-to-low-level transition on CS is required to
enter active state
? 2009 Microchip Technology Inc.
Preliminary
DS22126B-page 11
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