hn58x24256as Renesas Electronics Corporation., hn58x24256as Datasheet - Page 16

• Manufacturer Part Number: hn58x24256as
• Description: Two-wire Serial Interface 256k Eeprom 32-kword ?? 8-bit
• Manufacturer: Renesas Electronics Corporation.

HN58X24256AS
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
Rev.0.01, Mar.22.2007, page 16 of 20
Notes: 1. Don't care bit
256k
Start
2. 2nd device address code (#) should be same as 1st (@).
1 0 1 0
Device
address
@@@
W
R/W
1st Memory
address (n)
ACK
Dummy write
ACK
2nd Memory
address (n)
ACK
1 0 1 0
Start
Device
address
# # #
R/W
ACK
Currect address read
R
Read data (n)
No ACK
Stop