HN58X2402SFPI データシートの表示（PDF） - Hitachi -> Renesas Electronics

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HN58X2402SFPI

Two-wire serial interface 2k EEPROM (256-word × 8-bit) 4k EEPROM (512-word × 8-bit)

Hitachi -> Renesas Electronics 

HN58X2402SI/HN58X2404SI

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 4kbit

EEPROMs, some bits of their device address code may be used as the memory address bits. For example,

A0 is used as a8 of memory address for the 4kbit. 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

Device address word (8-bit)

Device code (fixed)

Device address code*1

2k

1

0

1

0

A2

A1

A0

4k

1

0

1

0

A2

A1

a8

Notes: 1. A2 to A0 are device address and a8 are memory address.

2. R/W=“1” is read and R/W = “0” is write.

R/W code*2

R/W

R/W

11

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