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R1EX24512BSAS0A/R1EX24512BTAS0A
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
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
No
No
Send
memory address
Send
start condition
Send
stop condition
Proceed write operation
R10DS0025EJ0001 Rev.0.01
Sep, 01, 2010
Proceed random address
read operation
Send
stop condition
Page 12 of 17
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