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SLA24C04-D Datasheet(PDF) 9 Page - Siemens Semiconductor Group

No. de pieza SLA24C04-D
Descripción Electrónicos  4 Kbit 512 x 8 bit Serial CMOS EEPROMs, I2C Synchronous 2-Wire Bus
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Fabricante Electrónico  SIEMENS [Siemens Semiconductor Group]
Página de inicio  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SLA24C04-D Datasheet(HTML) 9 Page - Siemens Semiconductor Group

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SLx 24C04
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).
Contains address information: in the CSW Command Byte, the
bit position b1 is decoded for the uppermost EEPROM address bit
A8 (in the CSR Command Byte, the bit positions b3 to b1 are left
undefined, in the CSW Command Byte, the bit positions b3 and b2
as well).
Control Byte
Following CSW (b0 = 0): contains the eight lower bits of the
EEPROM address (EEA) bit A7 to A0.
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
A8
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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