hn58x24256as Renesas Electronics Corporation., hn58x24256as Datasheet - Page 14

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

HN58X24256AS
Acknowledge Polling:
Acknowledge polling feature is used to show if the EEPROM is in a internally-timed write cycle or not.
This feature is initiated by the stop condition after inputting write data. This requires the 8-bit device
address word following the start condition during a internally-timed write cycle. Acknowledge polling
will operate when the R/W code = “0”. Acknowledgment “1” (no acknowledgment) shows the EEPROM
is in a internally-timed write cycle and acknowledgment “0” shows that the internally-timed write cycle has
completed. See Write Cycle Polling using ACK.
Write Cycle Polling Using ACK
Rev.0.01, Mar.22.2007, page 14 of 20
Proceed write operation
Proceed random address
addressing the memory
device address word
to initiate write cycle
Next operation is
memory address
write command
stop condition
read operation
start condition
with R/W = 0
returned
Send
Send
Send
Send
ACK
Send
Yes
Yes
No
No
start condition
stop condition
Send
Send
stop condition
Send