HN58X24512I Datasheet, PDF (13/19 Pages) Hitachi Semiconductor – Two-wire serial interface 512k EEPROM (64-kword ´ 8-bit)

HN58X24512I
Acknowledge Polling:
Acknowledge polling feature is used to show if the EEPROM is in a internally-timed write cycle or not.
This features 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 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
Send
write command
Send
stop condition
to initiate write cycle
Send
start condition
Send
device address word
with R/W = 0
ACK
returned
Yes
Next operation is
addressing the memory
Yes
Send
memory address
No
No
Send
start condition
Send
stop condition
Proceed write operation
Proceed random address
read operation
Send
stop condition
Rev.2.00, Dec.13.2004, page 13 of 17