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ST25EM1TR датащи(PDF) 9 Page - STMicroelectronics

номер детали ST25EM1TR
подробное описание детали  16 Kbit Serial I2C EEPROM with Extended Addressing
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25EM1TR датащи(HTML) 9 Page - STMicroelectronics

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could result in data being overwritten. Note that for
any write mode, the generation by the master of the
STOP condition starts the internal memory pro-
gram cycle. All inputs are disabled until the comple-
tion of this cycle and the ST24/25E16 will not
respond to any request.
Minimizing System Delay by Polling On ACK.
During the internal Write cycle, the ST24/25E16
disable itself from the bus in order to copy the data
from the internal latches to the memory cells. The
maximum value of the Write time (tW) is given in the
AC Characteristics table, this timing value may be
reduced by an ACK polling sequence issued by the
master.
The sequence is:
– Initial condition: a Write is in progress (see Fig-
ure 7).
– Step 1: the Master issues a START condition
followed by a Device Select byte. (1st byte of
the new instruction)
– Step 2: if the ST24/25E16 are internally writ-
ing, no ACK will be returned. The Master goes
back to Step1. If the ST24/25E16 have termi-
nated the internal writing, it will issue an ACK.
The ST24/25E16 are ready to receive the sec-
ond part of the instruction (the first byte of this
instruction was already sent during Step1).
WRITE Cycle
in Progress
AI01099B
Next
Operation is
Addressing the
Memory
START Condition
DEVICE SELECT
with RW = 0
ACK
Returned
YES
NO
YES
NO
ReSTART
STOP
Proceed
WRITE Operation
Proceed
Random Address
READ Operation
Send
Byte Address
First byte of instruction
with RW = 0 already
decoded by ST24xxx
Figure 7. Write Cycle Polling using ACK
9/16
ST24E16, ST25E16


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