23A640-E/P MICROCHIP [Microchip Technology], 23A640-E/P Datasheet - Page 12

• Manufacturer Part Number: 23A640-E/P
• Description: 64K SPI Bus Low-Power Serial SRAM
• Manufacturer: MICROCHIP [Microchip Technology]

23A640/23K640
2.6
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:
2.7
The 23X640 powers on in the following state:
• The device is in low-power Standby mode
• A high-to-low-level transition on CS is required to
DS22126C-page 12
(CS = 1)
enter active state
SCK
SO
CS
SI
Write Status Register Instruction
(WRSR)
Power-On State
0
0
WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)
0
1
0
Instruction
2
0
3
0
4
0
5
High-Impedance
0
6
1
7
7
8
6
9
Data to STATUS Register
10
5
11
4
© 2009 Microchip Technology Inc.
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