23K256-I/SN Microchip Technology Inc., 23K256-I/SN Datasheet - Page 11

• Manufacturer Part Number: 23K256-I/SN
• Description: 256K 32K X 8 2.7V SERIAL SRAM IND
• Manufacturer: Microchip Technology Inc.

Specifications of 23K256-I/SN

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

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:
© 2009 Microchip Technology Inc.
MODE MODE
W/R = writable/readable.
SCK
W/R
CS
SO
7
SI
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 2-7 and
Figure 2-8.
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 Figure 2-7 for the RDSR timing sequence.
7
8
6
9
Data from STATUS Register
10
5
23A256/23K256
11
4
12
3
13
2
14
1
DS22100D-page 11
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0