R1EX24032ASAS0G/R1EX24032ATAS0G

Preliminary

R10DS0081EJ0300 Rev.3.00

Page 13 of 16

Jan 30, 2014

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 2

× 8-bit 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

@@@

Notes: 1. Don't care bit

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

Device

address

Device

address

1st Memory

address (n)

2nd Memory

address (n)

Read data (n)

32k

10 10

## #

10 10

R

W

Stop

Start

Start

ACK

ACK

No ACK

ACK

R/W

ACK

R/W

Dummy write

Current address read

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

Device

address

Read data (n+m)

Read data (n)

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

32k

10 10

R

Stop

Start

ACK

ACK

No ACK

ACK

R/W

ACK