HN58W241000FPIE RENESAS [Renesas Technology Corp], HN58W241000FPIE Datasheet - Page 10

• Manufacturer Part Number: HN58W241000FPIE
• Manufacturer: RENESAS [Renesas Technology Corp]

HN58W241000I
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. The
device address code selects one device out of all devices which are connected to the bus. This means that the device is
selected if the inputted 3-bit device address code is equal to the corresponding hard-wired A2 to A1 pin status. The
third bit of the device address code is used as memory address. The eighth bit of the device address word is the
read/write(R/W) bit. A write operation is initiated if this bit is low and a read operation is initiated if this bit is high.
Upon a compare of the device address word, the EEPROM enters the read or write operation after outputting the zero
as an acknowledge. 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 A1 to A2.
Device Address Word
Device address word (8-bit)
1
Device code (fixed)
Device address code
R/W code*
1M
1
0
1
0
A2
A1
a16
R/W
Notes: 1. R/W=“1” is read and R/W = “0” is write.
Rev.3.00,
Jul.12.2005,
page 10 of 18