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S-24C01AFJA-11-S Datasheet(PDF) 11 Page - Seiko Instruments Inc

Part # S-24C01AFJA-11-S
Description  CMOS 2-WIRE SERIAL EEPROM
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-24C01AFJA-11-S Datasheet(HTML) 11 Page - Seiko Instruments Inc

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CMOS 2-WIRE SERIAL EEPROM
Rev. 2.2_30
S-24C01A/02A/04A
Seiko Instruments Inc.
11
7.
Read
7.1 Current Address Read
The EEPROM is capable of storing the last accessed memory address during both writing and
reading. The memory address is stored as long as the power voltage is more than the retention
voltage V
AH.
Accordingly, when the master device recognizes the position of the address pointer inside the
EEPROM, data can be read from the memory address of the current address pointer without
assigning a word address. This is called "Current Address Read."
"Current Address Read" is explained for when the address counter inside the EEPROM is an "n"
address.
When the EEPROM receives a 7-bit length device address and a 1-bit read/write instruction code
"1," following the start condition signal, it outputs the acknowledgment signal. However, in the S-
24C04A, page address P0 becomes invalid, and the memory address of the current address pointer
becomes valid.
Next, 8-bit length data at an "n" address is output from the EEPROM, in synchronization with the
SCL clock.
The address counter is incremented at the falling edge of the SCL clock by which the 8th bit of data
is output, and the address counter goes to address n+1.
The master device does not output the acknowledgment signal and transmits the stop condition
signal to finish reading.
For recognition of the address pointer inside the EEPROM, take into consideration the following:
The memory address counter inside the EEPROM is automatically incremented for every falling
edge of the SCL clock by which the 8th bit of data is output during the time of reading. During the
time of writing, upper bits of the memory address (upper 5 bits of the word address in the S-24C01A
and S-24C02A; upper 4 bits of the word address and page address P0 in the S-24C04A) are left
unchanged and are not incremented.
Figure 12 Current Address Read
S
T
A
R
T
1 0 1 0
R
E
A
D
S
T
O
P
DEVICE
ADDRESS
R
/
W
M
S
B
SDA LINE
ADR INC
A2 A1 A0
D7 D6 D5 D4 D3 D2 D1 D0
A
C
K
L
S
B
1
DATA
NO ACK from
Master
Device
(A0 is P0 in the S-24C04A)


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