HN58X2432SI_05 Datasheet, PDF (16/22 Pages) Renesas Technology Corp – Two-wire serial interface 32k EEPROM (4-kword × 8-bit)/64k EEPROM (8-kword × 8-bit)

HN58X2432SI/HN58X2464SI
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
32k to
64k
Start
Device
address
@@@
1010
W
1st Memory
address (n)
ACK
R/W
Dummy write
2nd Memory
address (n)
ACK
Device
address
###
1010
R
Start ^R/W
ACK
ACK
Read data (n)
No ACK
Stop
Currect address read
Notes: 1. Don‘t care bits for 32k and 64k.
2. Don‘t care bit for 32k.
3. 2nd device address code (#) should be same as 1st (@).
Rev.2.00, Jan.11.2005, page 16 of 20