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Intel

®

 Atom™ Processor E3800 Product Family

Datasheet

3821

However, according to the I

2

C specification, standard mode devices are not upward 

compatible and should not be incorporated in a fast-mode I

2

C bus system since they 

cannot follow the higher transfer rate and unpredictable states would occur.

•

The I

2

C master is responsible for generating the clock and controlling the transfer 

of data.

•

The slave is responsible for either transmitting or receiving data to/from the 
master. 

•

The acknowledgement of data is sent by the device that is receiving data, which 
can be either a master or a slave.

•

Each slave has a unique address that is determined by the system designer:

— When a master wants to communicate with a slave, the master transmits a 

START/RESTART condition that is then followed by the slave's address and a 
control bit (R/W), to determine if the master wants to transmit data or receive 
data from the slave.

— The slave then sends an acknowledge (ACK) pulse after the address.

•

If the master (master-transmitter) is writing to the slave (slave-receiver)

— The receiver gets one byte of data.

— This transaction continues until the master terminates the transmission with a 

STOP condition.

•

If the master is reading from a slave (master-receiver)

— The slave transmits (slave-transmitter) a byte of data to the master, and the 

master then acknowledges the transaction with the ACK pulse. 

— This transaction continues until the master terminates the transmission by not 

acknowledging (NACK) the transaction after the last byte is received, and then 
the master issues a STOP condition or addresses another slave after issuing a 
RESTART condition. This behavior is illustrated in below figure.

D a t a

C l o c k

S T A R T   o r  

R E S T A R T  
C o n d i t i o n s

S

o r

R

M S B

L S B

A C K

f r o m   s l a v e

B y t e   C o m p l e t e  
I n t e r r u p t   w i t h i n  

S l a v e

C l o c k   h e l d   l o w  

w h i l e   s e r v i c i n g  

i n t e r r u p t s

S T O P   A N D  

R E S T A R T  
C o n d i t i o n s

P   o r   R

R   o r   P

1

2

3 - 8

7

8

9

1

2

9

f r o m   r e c e i v e r

A C K