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

Random Read:

This is a read operation with defined read address. A random read requires a dummy write to set read

address. The EEPROM receives a start condition, device address word(R/W=0) and memory address

sequentially. The EEPROM outputs acknowledgment “0” after receiving memory address then enters a

current address read with receiving a start condition. The EEPROM outputs the read data of the address

which was defined in the dummy write operation. After receiving acknowledgment “1”(no

acknowledgment) and a following stop condition, the EEPROM stops the random read operation and

returns to a standby state.

Random Read Operation

2k, 4k

Start

Device

address

@@@

1010

W

Memory

address (n)

ACK

R/W

Dummy write

Device

address

###

1010

R

Read data (n)

Start

ACK

ACK No ACK

R/W

Stop

Currect address read

Note: 1. 2nd device address code (#) should be same as 1st (@).

Sequential Read:

Sequential reads are initiated by either a current address read or a random read. If the EEPROM receives

acknowledgment “0” after 8-bit read data, the read address is incremented and the next 8-bit read data are

coming out. This operation can be continued as long as the EEPROM receives acknowledgment “0”. The

address will roll over and returns address zero if it reaches the last address of the last page. The sequential

read can be continued after roll over. The sequential read is terminated if the EEPROM receives

acknowledgment “1” (no acknowledgment) and a following stop condition.

Sequential Read Operation

2k, 4k

Start

Device

address

1010

Read data (n) Read data (n+1) Read data (n+2) Read data (n+m)

R

ACK

R/W

ACK

ACK ACK

No ACK

Stop

15

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