X24F064/032/016

4

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

6686 ILL F06

SCL FROM

MASTER

DATA OUTPUT

FROM

TRANSMITTER

1

8

9

DATA

OUTPUT

FROM

RECEIVER

START

ACKNOWLEDGE