EKTF6708 datasheet(129/158 Pages) EMC

129 / 158 page

eKTF6708

8-Bit Microcontroller

IC Product Specification (V1.2) 03.12.2020

 119

(This specification is subject to change without prior notice)

 Master-Transmitter Transmits to Slave-Receiver with a 10-bit

Slave Address

When the Slave receives the first byte after START bit from Master, each Slave device will

compare the first seven bits of the first byte (11110XX) with their own address and check

the 8th bit (R//W). If the R//W bit is

“0”, a Slave or more, will return an Acknowledge (A1).

Then all Slave devices will continue to compare the second address (XXXXXXXX). If a

Slave device finds a match, that particular Slave device will be the only one to return an

Acknowledge (A2). The matched Slave device will remain addressed by the Master until it

receives the STOP condition or until a repeated START condition followed by the different

Slave address is received.

Write

1st 7 Bits

1 1 1 1 0 X X

A//A

Data

R//W

Slave

Address

Slave

Address

2nd 8 Bits

Figure 6-14a Master-Transmitter Transmits to Slave-Receiver with a 10-Bit Slave Address

 Master-Receiver Read Slave-Transmitter with a 10-bit Slave Address

Up to, and including Acknowledge Bit A2, the procedure is the same as that described

above for Master-Transmitter addressing a Slave-Receiver. After the Acknowledge (A2), a

repeated START condition (Sr) takes place followed by seven bits Slave address

(11110XX), but the 8th bit R//W is

“1.” The addressed Slave device will then return the

Acknowledge (A3). If the repeated START (Sr) condition occurs and the seven bits of first

byte (11110XX) are received by Slave device, all the Slave devices will compare with their

own addresses and check the 8th bit (R//W). However, none of the Slave devices can

return an acknowledgement because R//W=1.

Write

1st 7 Bits

1 1 1 1 0 X X

2nd 8 Bits

Read

1st 7 Bits

1 1 1 1 0 X X

Slave

Address

Slave

Address

Slave

Address

DATA

R//W

Figure 6-14b Master-Receiver reads Slave-Transmitter with a 10-Bit Slave Address

 Master Transmits and Receives Data to and from the Same Slave Device

with 10-Bit Addresses

The initial operation of this data transfer format is the same as explained in the above

paragraph on “Master-Transmitter transmits to Slave-Receiver with a 10-bit Slave

Address.

” Then the Master device starts to transmit the data to the Slave device. When

the Slave device receives the Acknowledge or None-Acknowledge that is followed by

repeat START (Sr), the

above operation under “Master-Receiver Reads Slave-Transmitter

with a 10-Bit Slave Address

” is repeatedly performed.

EKTF6708 데이터시트(PDF) 129 Page - ELAN Microelectronics Corp

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