R1EX24256BSAS0I/R1EX24256BTAS0I

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

Send

memory address

Send

start condition

Send

stop condition

Send

stop condition

Proceed random address

read operation

Proceed write operation

Next operation is

addressing the memory

Yes

Yes

No

No

ACK

returned

R10DS0007EJ0100 Rev.1.00

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Aug. 04, 2010