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ST25W01M5TR датащи(PDF) 10 Page - STMicroelectronics

номер детали ST25W01M5TR
подробное описание детали  SERIAL 1K 128 x 8 EEPROM
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST25W01M5TR датащи(HTML) 10 Page - STMicroelectronics

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Minimizing System Delays by Polling On ACK.
During the internal write cycle, the memory discon-
nects 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, since the typical time
is shorter, the time seen by the system may be
reduced by an ACK polling sequence issued by the
master. The sequence is as follows:
– 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 memory is busy with the internal
write cycle, no ACK will be returned and the
master goes back to Step 1. If the memory
has terminated the internal write cycle, it will
respond with an ACK, indicating that the mem-
ory is ready to receive the second part of the
next instruction (the first byte of this instruc-
tion was already sent during Step 1).
Read Operations
Read operations are independent of the state of the
MODE pin. On delivery, the memory content is set
at all "1’s" (or FFh).
Current Address Read. The memory has an inter-
nal byte address counter. Each time a byte is read,
this counter is incremented. For the Current Ad-
dress Read mode, following a START condition,
the master sends a memory address with the RW
bit set to ’1’. The memory acknowledges this and
outputs the byte addressed by the internal byte
address counter. This counter is then incremented.
The master does NOT acknowledge the byte out-
put, but terminates the transfer with a STOP con-
dition.
Random Address Read. A dummy write is per-
formed to load the address into the address
counter, see Figure 10. This is followed by another
START condition from the master and the byte
address is repeated with the RW bit set to ’1’. The
memory acknowledges this and outputs the byte
addressed. The master have to NOT acknowledge
the byte output, but terminates the transfer with a
STOP condition.
BYTE WRITE
DEV SEL
BYTE ADDR
DATA IN
MULTIBYTE
AND
PAGE WRITE
DEV SEL
BYTE ADDR
DATA IN 1
DATA IN 2
AI00793
DATA IN N
ACK
ACK
ACK
R/W
ACK
ACK
ACK
R/W
ACK
ACK
Figure 8. Write Modes Sequence (ST24/25C01 and ST24C01R)
10/16
ST24/25C01, ST24C01R, ST24/25W01


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