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M24256-A Datasheet(PDF) 8 Page - STMicroelectronics

Part # M24256-A
Description  256 Kbit Serial I C Bus EEPROM With Two Chip Enable Lines
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M24256-A Datasheet(HTML) 8 Page - STMicroelectronics

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The output data comes from consecutive address-
es, with the internal address counter automatically
incremented after each byte output. After the last
memory address, the address counter ‘rolls-over’
and the memory continues to output data from
memory address 00h.
Acknowledge in Read Mode
In all read modes, the memory waits, after each
byte read, for an acknowledgment during the 9th
bit time. If the master does not pull the SDA line
low during this time, the memory terminates the
data transfer and switches to its stand-by state.
Current Address Read
The device has an internal address counter which
is incremented each time a byte is read. For the
Current Address Read mode, following a START
condition, the master sends a Device Select Code
with the RW bit set to ‘1’. The memory acknowl-
edges this, and outputs the byte addressed by the
internal address counter. The counter is then in-
cremented. The master terminates the transfer
with a STOP condition, as shown in Figure 8,
with-
out acknowledging the byte output.
Sequential Read
This mode can be initiated with either a Current
Address Read or a Random Address Read. The
master
does acknowledge the data byte output in
this case, and the memory continues to output the
next byte in sequence. To terminate the stream of
bytes, the master must
not acknowledge the last
byte output, and
must generate a STOP condition.
Figure 7. Write Cycle Polling Flowchart using ACK
WRITE Cycle
in Progress
AI01847C
Next
Operation is
Addressing the
Memory
START Condition
DEVICE SELECT
with RW = 0
ACK
Returned
YES
NO
YES
NO
ReSTART
STOP
DATA for the
WRITE Operation
DEVICE SELECT
with RW = 1
Send Address
and Receive ACK
First byte of instruction
with RW = 0 already
decoded by the device
YES
NO
START
Condition
Continue the
WRITE Operation
Continue the
Random READ Operation


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