hn58x24512fpie Renesas Electronics Corporation., hn58x24512fpie Datasheet - Page 15

• Manufacturer Part Number: hn58x24512fpie
• Description: Two-wire Serial Interface 512k Eeprom 64-kword ?? 8-bit
• Manufacturer: Renesas Electronics Corporation.

HN58X24512I
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
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
Rev.2.00, Dec.13.2004, page 15 of 17
Notes: 1. 2nd device address code (#) should be same as 1st (@).
Start
Start
Note: 1. Don't care bit.
2. Don't care bit.
1 0 1 0 0
1 0 1 0 0
Device
address
Device
address
@@
W
R
R/W
R/W
1st Memory
address (n)
ACK
ACK
Read data (n)
Dummy write
Read data (n+1) Read data (n+2)
ACK
ACK
2nd Memory
address (n)
ACK
ACK
1 0 1 0 0
Start
Device
address
R/W
ACK
ACK
Currect address read
# #
R
Read data (n+m)
Read data (n)
No ACK
No ACK
Stop
Stop