X24F064/032/016

3

DEVICE OPERATION

The X24F064/032/016 supports a bidirectional bus ori-

ented protocol. The protocol defines any device that

sends data onto the bus as a transmitter, and the re-

ceiving device as the receiver. The device controlling

the transfer is a master and the device being controlled

is the slave. The master will always initiate data trans-

fers, and provide the clock for both transmit and receive

operations. Therefore, the X24F064/032/016 will be

considered a slave in all applications.

Clock and Data Conventions

Data states on the SDA line can change only during

SCL LOW. SDA state changes during SCL HIGH are

reserved for indicating start and stop conditions. Refer

to Figures 1 and 2.

Start Condition

All commands are preceded by the start condition,

which is a HIGH to LOW transition of SDA when SCL is

HIGH. The X24F064/032/016 continuously monitors

the SDA and SCL lines for the start condition and will

not respond to any command until this condition has

been met.

SCL

SDA

DATA STABLE

DATA

CHANGE

6686 ILL F04

SCL

SDA

START BIT

STOP BIT

6686 ILL F05

Figure 1. Data Validity

Figure 2. Definition of Start and Stop

device requires to perform the internal program operation.