hn58x2408stie Renesas Electronics Corporation., hn58x2408stie Datasheet - Page 10

• Manufacturer Part Number: hn58x2408stie
• Description: Two-wire Serial Interface 8k Eeprom 1-kword ?? 8-bit 16k Eeprom 2-kword ?? 8-bit
• Manufacturer: Renesas Electronics Corporation.

HN58X2408SI/HN58X2416SI
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 3-bit device address code in the
order of A2, A1, A0. 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-A0 pin status. As for the 8kbit and 16kbit EEPROMs, whole or some bits of their device address code may be used
as the memory address bits. For example, A0 and A1 are used as a8 and a9 for the 8kbit. The 16kbit doesn't use the
device address code instead all 3 bits are used as the memory address bits a8, a9 and a10. 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 A0 to A2.
Device Address Word
Notes: 1. A2 to A0 are device address and a10 to a8 are memory address.
Rev.2.01, Jan.21.2005, page 10 of 17
16k
8k
2. R/W=“1” is read and R/W = “0” is write.
1
1
Device code (fixed)
0
0
1
1
Device address word (8-bit)
0
0
a10
A2
Device address code*
a9
a9
1
a8
a8
R/W code*
R/W
R/W
2