S-24CS08A Seiko Instruments, S-24CS08A Datasheet - Page 17

• Manufacturer Part Number: S-24CS08A
• Description: (S-24CS0xA) 2-Wire CMOS Serial EPROM
• Manufacturer: Seiko Instruments

www.DataSheet4U.com
Rev.2.0
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 E
following a start condition, it responds with an acknowledge. The E
address and responds with an acknowledge. The memory address is loaded to the address counter in the
E
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 E
"1", following a start condition signal, it responds with an acknowledge. Next, 8-bit data is transmitted from
the E
the reading with a stop condition.
2
PROM by these operations. Reception of write data does not follow in a dummy write whereas reception
_10
2
PROM in synchronous to the SCL clock. The master device has to not acknowledge and terminates
SDA
LINE
Remark1. A1 is P1 in the S-24CS08A.
2
PROM receives a 7-bit device address and a 1-bit read / write instruction code set to "0"
S
T
A
R
T
2. A0 is P0 in the S-24CS04A/08A.
3. W7 is optional in the S-24CS01A.
M
S
B
1 0 1 0 A2 A1 A0 0
2
PROM receives a 7-bit device address and a 1-bit read / write instruction code set to
ADDRESS
DEVICE
DUMMY WRITE
L
S
B
W
R
T
E
R
W
I
/
A
C
K
W7 W6 W5 W4 W3 W2 W1 W0
Figure 15 Random Read
ADDRESS (n)
WORD
Seiko Instruments Inc.
A
C
K
S
T
A
R
T
M
S
B
1 0 1 0 A2 A1 A0 1
ADDRESS
DEVICE
2-WIRE CMOS SERIAL E
L
S
B
2
PROM then receives an 8-bit word
R
W
R
E
A
D
/
A
C
K
S-24CS01A/02A/04A/08A
D7 D6 D5 D4 D3 D2 D1 D0
Master Device
NO ACK from
DATA
ADR INC
S
T
O
P
2
PROM
17