HN58X2402SFPIAGE データシートの表示（PDF） - Renesas Electronics

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HN58X2402SFPIAGE

Two-wire serial interface

Renesas Electronics 

HN58X2402SFPIAG/HN58X2404SFPIAG

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 has 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 has 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

Rev.4.00, Jul.13.2005, page 13 of 16

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