hn58x2408fpiage Renesas Electronics Corporation., hn58x2408fpiage Datasheet - Page 16

• Manufacturer Part Number: hn58x2408fpiage
• Description: Memory>eeprom>serial Eeprom Two-wire Serial Interface
• Manufacturer: Renesas Electronics Corporation.

HN58X2408/HN58X2416/HN58X2432/HN58X2464FPIAG
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 (8-
bit for 8kbit to 16kbit EEPROMs, 2 × 8-bit for 32kbit and 64kbit EEPROMs) 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.3.00, Dec.21.2004, page 16 of 19
Notes: 1. Don‘t care bits for 32k and 64k.
8k to
32k to
16k
64k
Start
Start
2. Don‘t care bit for 32k.
3. 2nd device address code (#) should be same as 1st (@).
1 0 1 0
1 0 1 0
Device
address
Device
address
@@@
@@@
Dummy write
W
W
R/W
R/W
Memory
address (n)
1st Memory
address (n)
ACK
ACK
Dummy write
ACK
ACK
2nd Memory
address (n)
1 0 1 0
Start
Device
address
# # #
Currect address read
R
R/W
ACK
1 0 1 0
Start
ACK
Read data (n)
Device
address
No ACK
# # #
R/W
ACK
Currect address read
Stop
R
Read data (n)
No ACK
Stop