S24CSO View Datasheet(PDF) - Seiko Instruments Inc
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Description
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S24CSO Datasheet PDF : 37 Pages
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FOR AUTOMOTIVE 105°C OPERATION 2-WIRE SERIAL E2PROM
S-24CS01A/02A/04A H Series
Rev.3.1_03
7. 2 Random read
Random read is used to read the data at an arbitrary memory address.
A dummy write is performed to load the memory address into the address counter.
When the S-24CS01A/02A/04A receives a 7-bit device address and a 1-bit read / write instruction code set to "0"
following a start condition, it responds with an acknowledge. The S-24CS01A/02A/04A then receives an 8-bit word
address and responds with an acknowledge. The memory address is loaded to the address counter in the
S-24CS01A/02A/04A by these operations. Reception of write data does not follow in a dummy write whereas reception
of write data follows in a byte write and in a page write.
Since the memory address is loaded into the memory address counter by dummy write, the master device can read the
data starting from the arbitrary memory address by transmitting a new start condition and performing the same
operation in the current address read.
That is, when the S-24CS01A/02A/04A receives a 7-bit device address and a 1-bit read / write instruction code set to
"1", following a start condition signal, it responds with an acknowledge. Next, 8-bit data is transmitted from the
S-24CS01A/02A/04A in synchronous to the SCL clock. The master device outputs stop condition not an acknowledge ,
the reading of S-24CS01A/02A/04A is ended.
SDA
LINE
S
W
T
R
A
I
R
DEVICE T
T
ADDRESS E
S
T
A
WORD
R
ADDRESS (n)
T
R
E
DEVICE A
ADDRESS D
NO ACK from
Master Device
S
T
O
DATA
P
1 0 1 0 A2 A1 A0 0 W7 W6 W5 W4 W3 W2 W1 W0
M
L RA
A
S
S /C
C
B
B WK
K
1 0 1 0 A2 A1 A0 1 D7 D6 D5 D4 D3 D2 D1 D0
M
LR A
S
S/ C
B
BWK
ADR INC
DUMMY WRITE
Remark1. A0 is P0 in the S-24CS04A.
2. W7 is optional in the S-24CS01A.
Figure 16 Random Read
16
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