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M24512-W Datasheet(PDF) 17 Page - STMicroelectronics

Part No. M24512-W
Description  512 Kbit and 256 Kbit serial I²C bus EEPROM with three Chip Enable lines
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M24512-W Datasheet(HTML) 17 Page - STMicroelectronics

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M24512-x, M24256-Bx
Device operation
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Figure 9.
Write cycle polling flowchart using ACK
3.10
Minimizing system delays by polling on ACK
During the internal Write cycle, the device disconnects itself from the bus, and writes a copy
of the data from its internal latches to the memory cells. The maximum Write time (tw) is
shown in Table 13., but the typical time is shorter. To make use of this, a polling sequence
can be used by the bus master.
The sequence, as shown in Figure 9., is:
Initial condition: a Write cycle is in progress.
Step 1: the bus master issues a Start condition followed by a device select code (the
first byte of the new instruction).
Step 2: if the device is busy with the internal Write cycle, no Ack will be returned and
the bus master goes back to Step 1. If the device has terminated the internal Write
cycle, it responds with an Ack, indicating that the device is ready to receive the second
part of the instruction (the first byte of this instruction having been sent during Step 1).
Write cycle
in progress
AI01847d
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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