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CAT24C03YI-T Scheda tecnica(PDF) 8 Page - Catalyst Semiconductor

Il numero della parte CAT24C03YI-T
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CAT24C03
8
Doc. No. 1113, Rev. A
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
READ OPERATIONS
Immediate Address Read
In standby mode, the CAT24C03 internal address counter
points to the data byte immediately following the last byte
accessed by a previous operation. If that ‘previous’ byte
was the last byte in memory, then the address counter
will point to the 1st memory byte, etc.
When, following a START, the CAT24C03 is presented
with a Slave address containing a ‘1’ in the R/W bit
position (Figure 8), it will acknowledge (ACK) in the 9th
clock cycle, and will then transmit data being pointed
at by the internal address counter. The Master can stop
further transmission by issuing a NoACK, followed by a
STOP condition.
Selective Read
The Read operation can also be started at an address
different from the one stored in the internal address coun-
ter. The address counter can be initialized by performing
a ‘dummy’ Write operation (Figure 9). Here the START
is followed by the Slave address (with the R/W bit set
to ‘0’) and the desired byte address. Instead of follow-
ing up with data, the Master then issues a 2nd START,
followed by the ‘Immediate Address Read’ sequence,
as described earlier.
Sequential Read
If the Master acknowledges the 1st data byte transmitted
by the CAT24C03, then the device will continue trans-
mitting as long as each data byte is acknowledged by
the Master (Figure 10). If the end of memory is reached
during sequential Read, then the address counter will
‘wrap-around’to the beginning of memory, etc. Sequential
Read works with either ‘Immediate Address Read’ or
‘Selective Read’, the only difference being the starting
byte address.


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