X24F064/032/016
Stop Condition
All communications must be terminated by a stop
condition, which is a LOW to HIGH transition of SDA
when SCL is HIGH. The stop condition is also used to
place the device into the standby power mode after a
read sequence. A stop condition can only be issued
after the transmitting device has released the bus.
Acknowledge
Acknowledge is a software convention used to indicate
successful data transfer. The transmitting device,
either master or slave, will release the bus after trans-
mitting eight bits. During the ninth clock cycle the
receiver will pull the SDA line LOW to acknowledge
that it received the eight bits of data. Refer to Figure 3.
The X24F064/032/016 will respond with an acknowl-
edge after recognition of a start condition and its slave
address. If both the device and a write operation have
been selected, the X24F064/032/016 will respond with
an acknowledge after the receipt of each subsequent
eight-bit word.
In the read mode the X24F064/032/016 will transmit
eight bits of data, release the SDA line and monitor
the line for an acknowledge. If an acknowledge is
detected and no stop condition is generated by the
master, the X24F064/032/016 will continue to
transmit data. If an acknowledge is not detected, the
device will terminate further data transmissions. The
master must then issue a stop condition to return the
X24F064/032/016 to the standby power mode and
place the device into a known state.
Figure 3. Acknowledge Response From Receiver
SCL FROM
MASTER
1
8
9
DATA OUTPUT
FROM
TRANSMITTER
DATA
OUTPUT
FROM
RECEIVER
START
ACKNOWLEDGE
6686 ILL F06
4
XICOR [ XICOR INC. ]
