23K256 MICROCHIP [Microchip Technology], 23K256 Datasheet - Page 11

• Manufacturer Part Number: 23K256
• Description: 256K SPI Bus Low-Power Serial SRAM
• Manufacturer: MICROCHIP [Microchip Technology]

2.5
The Read Status Register instruction (RDSR) provides
access to the STATUS register. The STATUS register
may be read at any time. The STATUS register is
formatted as follows:
TABLE 2-2:
FIGURE 2-7:
 2010 Microchip Technology Inc.
MODE MODE
W/R = writable/readable.
W/R
7
CS
SI
SO
SCK
Read Status Register Instruction
(RDSR)
W/R
6
0
0
READ STATUS REGISTER TIMING SEQUENCE (RDSR)
STATUS REGISTER
5
–
0
0
1
High-Impedance
4
–
0
0
Instruction
2
3
–
0
0
3
2
–
0
0
4
0
1
–
1
HOLD
5
W/R
0
0
6
1
7
The mode bits indicate the operating mode of the
SRAM. The possible modes of operation are:
0 0 = Byte mode (default operation)
1 0 = Page mode
0 1 = Sequential mode
1 1 = Reserved
Write and read commands are shown in
Figure
The HOLD bit enables the Hold pin functionality. It must
be set to a ‘0’ before HOLD pin is brought low for HOLD
function to work properly. Setting HOLD to ‘1’ disables
feature.
Bits 1 through 5 are reserved and should always be set
to ‘0’.
See
7
8
Figure 2-7
6
2-8.
9
Data from STATUS Register
10
5
for the RDSR timing sequence.
11
4
12
3
13
2
23X256
14
1
DS22100E-page 11
Figure 2-7
15
0
and