S524A40X11/40X21/40X41/60X81/60X51 SERIAL EEPROM
POLLING FOR AN ACK SIGNAL
DATA SHEET
When the master issues a stop condition to initiate a write cycle, the S524A40X11/40X21/40X41/60X81/60X51
starts an internal write cycle. The master can then immediately begin polling for an ACK from the slave device.
To poll for an ACK signal in a write operation, the master issues a start condition followed by the slave address.
As long as the S524A40X11/40X21/40X41/60X81/60X51 remains busy with the write operation, no ACK is
returned. When the S524A40X11/40X21/40X41/60X81/60X51 completes the write operation, it returns an ACK
and the master can then proceed with the next read or write operation (see Figure 1-11).
Send Write
Command
Send Stop Condition to
Initiate Write Cycle
Send Start
Condition
Send Slave Address
with R/
W bit = "0"
No
ACK = "0" ?
Yes
Start Next
Operation
Figure 1-11. Master Polling for an ACK Signal from a Slave Device
1-10
SAMSUNG [ SAMSUNG ]
