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CAT24FC64KITE13REV-D Folha de dados(PDF) 7 Page - Catalyst Semiconductor

Nome de Peças CAT24FC64KITE13REV-D
Descrição Electrónicos  64K-Bit I2C Serial CMOS EEPROM
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Fabricante Electrônico  CATALYST [Catalyst Semiconductor]
Página de início  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24FC64KITE13REV-D Folha de dados(HTML) 7 Page - Catalyst Semiconductor

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CAT24FC64
7
Doc. No. 1046, Rev. G
READ OPERATIONS
The READ operation for the CAT24FC64 is initiated in
the same manner as the write operation with one
exception, that R/
W bit is set to one. Three different
READ operations are possible: Immediate/Current
Address READ, Selective/Random READ and
Sequential READ.
Immediate/Current Address Read
The CAT24FC64’s address counter contains the address
of the last byte accessed, incremented by one. In other
words, if the last READ or WRITE access was to address
N, the READ immediately following would access data
from address N+1. If N=E (where E=8,191), then the
counter will ‘wrap around’ to address 0 and continue to
clock out data. After the CAT24FC64 receives its slave
address information (with the R/
W bit set to one), it
issues an acknowledge, then transmits the 8 bit byte
requested. The master device does not send an
acknowledge, but will generate a STOP condition.
Selective/Random Read
Selective/Random READ operations allow the Master
device to select at random any memory location for a
READ operation. The Master device first performs a
‘dummy’ write operation by sending the START condition,
slave address and byte addresses of the location it
wishes to read. After CAT24FC64 acknowledges, the
Master device sends the START condition and the slave
address again, this time with the R/
W bit set to one. The
CAT24FC64 then responds with its acknowledge and
sends the 8-bit byte requested. The master device does
not send an acknowledge but will generate a STOP
condition.
Sequential Read
The Sequential READ operation can be initiated by
either the Immediate Address READ or Selective READ
operations. After the CAT24FC64 sends the initial 8-bit
byte requested, the Master will respond with an
acknowledge which tells the device it requires more
data. The CAT24FC64 will continue to output an 8-bit
byte for each acknowledge sent by the Master. The
operation will terminate when the Master fails to respond
with an acknowledge, thus sending the STOP condition.
The data being transmitted from CAT24FC64 is outputted
sequentially with data from address N followed by data
from address N+1. The READ operation address counter
increments all of the CAT24FC64 address bits so that
the entire memory array can be read during one operation.
If more than E (where E=8,191) bytes are read out, the
counter will ‘wrap around’ and continue to clock out data
bytes.
Figure 8. Immediate Address Read Timing
SCL
SDA
8TH BIT
STOP
NO ACK
DATA OUT
89
SLAVE
ADDRESS
S
A
C
K
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
N
O
A
C
K
DATA
S
T
O
P
P


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