s-24c04c Seiko Instruments Inc., s-24c04c Datasheet - Page 17

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s-24c04c

Manufacturer Part Number
s-24c04c
Description
2-wire Serial E2prom
Manufacturer
Seiko Instruments Inc.
Datasheet

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Rev.2.0
7. Read
7. 1 Current address read
Either in writing or in reading the S-24C04C holds the last accessed memory address. The memory address is
maintained as long as the power voltage does not decrease less than the operating voltage.
The master device can read the data at the memory address of the current address pointer without assigning the
word address as a result, when it recognizes the position of the address pointer in the S-24C04C. This is called
“Current Address Read”.
In the following the address counter in the S-24C04C is assumed to be “n”.
When the S-24C04C receives a 7-bit device address and a 1-bit read / write instruction code set to “1” following a
start condition, it responds with an acknowledge.
Next, an 8-bit data at the address “n” is sent from the S-24C04C synchronous to the SCL clock. The address
counter is incremented and the content of the address counter becomes n+1.
The master device outputs stop condition not an acknowledge, the reading of S-24C04C is ended.
Attention should be paid to the following point on the recognition of the address pointer in the S-24C04C.
In Read, the memory address counter in the S-24C04C is automatically incremented after output of the 8th bit of
the data. In Write, on the other hand, the upper bits of the memory address (the upper bits of the word address
and page address)
_00_C
1. In the S-24C04C, the upper 4 bits of the word address and the page address P0
SDA LINE
*1
S
T
A
R
T
are left unchanged and are not incremented.
M
S
B
1
0
ADDRESS
1
DEVICE
Figure 18 Current Address Read
0
A2 A1 P0
Seiko Instruments Inc.
S
B
L
W
R
1
/
R
E
A
D
C
A
K
D7 D6 D5 D4 D3 D2 D1 D0
Master Device
NO ACK from
DATA
2-WIRE SERIAL E
O
S
P
T
S-24C04C
2
PROM
17

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