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R1EX24004AxxS0A
Device Addressing
The EEPROM device requires an 8-bit device address word following a start condition to enable the chip
for a read or a write operation. The device address word consists of 4-bit device code, 3-bit device
address code and 1-bit read/write(R/W) code. The most significant 4-bit of the device address word are
used to distinguish device type and this EEPROM uses “1010” fixed code. The device address word is
followed by the 2-bit device address code A2, A1 memory adderess a8. The device address code selects
one device out of four devices which are connected to the bus. This means that the device is selected if
the inputted 2-bit device address code are equal to the corresponding hard-wired A2 , A1 pin status.
The eighth bit of the device address word is the read/write(R/W) bit. A write operation is initiated if this
bit is “0” and a read operation is initiated if this bit is “1” . The EEPROM turns to a stand-by state if the
device code is not “1010” or device address code doesn’t coincide with status of the correspond hard-wired
device address pins A2 to A0.
Device Address Word
Device address word (8-bit)
Device code (fixed)
Device address code
R/W code * 1
4k
1
0
1
0
A2
A1
a8
R/W
Note:
1. R/W=“1” is read and R/W = “0” is write.
REJ03C0353-0101 Rev.1.01 Jan. 9, 2009
Page 11 of 22
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