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

Read Operation

There are three read operations: current address read, random read, and sequential read. Read operations are

initiated the same way as write operations with the exception of R/W = “1”.

Current Address Read:

The internal address counter maintains the last address accessed during the last read or write operation,

with incremented by one. Current address read accesses the address kept by the internal address counter.

After receiving a start condition and the device address word(R/W is “1”), the EEPROM outputs the 8-bit

current address data from the most significant bit following acknowledgment “0” If the EEPROM receives

acknowledgment “1” (no acknowledgment) and a following stop condition, the EEPROM stops the read

operation and is turned to a standby state. In case the EEPROM have accessed the last address of the last

page at previous read operation, the current address will roll over and returns to zero address. In case the

EEPROM have accessed the last address of the page at previous write operation, the current address will

roll over within page addressing and returns to the first address in the same page. The current address is

valid while power is on. The current address after power on will be indefinite. The random read operation

described below is necessary to define the memory address.

Current Address Read Operation

2k, 4k

Device

address

1010

Read data (n+1)

R

Start

ACK No ACK

R/W

Note: 1. Don‘t care bit for 4k.

Stop

14

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