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SLA24C01-D-3 Fiches technique(PDF) 9 Page - Siemens Semiconductor Group

No de pièce SLA24C01-D-3
Description  1/2 Kbit 128/256 x 8 bit Serial CMOS EEPROMs, I2C Synchronous 2-Wire Bus
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Fabricant  SIEMENS [Siemens Semiconductor Group]
Site Internet  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SLA24C01-D-3 Fiches technique(HTML) 9 Page - Siemens Semiconductor Group

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SLx 24C01/02/P
Semiconductor Group
9
1998-07-27
4
Device Addressing and EEPROM Addressing
After a START condition, the master always transmits a Command Byte CSW or CSR.
After the acknowledge of the EEPROM a Control Byte follows, its content and the
transmitter depend on the previous Command Byte. The description of the Command
and Control Bytes is shown in table 2.
The device has an internal address counter which points to the current EEPROM
address.
The address counter is incremented
– after a data byte to be written has been acknowledged, during entry of further data
byte
– during a byte read, thus the address counter points to the following address after
reading a data byte.
Command Byte
Selects operation: the least significant bit b0 is low for a write
operation (Chip Select Write Command Byte CSW) or set high for a
read operation (Chip Select Read Command Byte CSR). In both
Command Bytes, the bit positions b3 to b1 are left undefined.
Control Byte
Following CSW (b0 = 0): contains the seven or eight lower bits of
the EEPROM address (EEA) bit A6 or A7 to A0, or an additional
command byte for the handling of the protection bit.
Following CSR (b0 = 1): contains the data read out, transmitted by
the EEPROM. The EEPROM data are read as long as the master
pulls down SDA after each byte in order to acknowledge the
transfer. The read operation is stopped by the master by releasing
SDA (no acknowledge is applied) followed by a STOP condition.
Table 2
Command and Control Byte for I
2C-Bus Addressing of Chip and EEPROM
Definition
Function
b7
b6
b5
b4
b3
b2
b1
b0
CSW
1
01
0x
x
x
0
Chip Select for Write
CSR
1
0
1
0
x
x
x
1
Chip Select for Read
EEA
A7
A6
A5
A4
A3
A2
A1
A0
EEPROM address


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