Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 633

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

The TWI has different modes of operations:



Master transmitter mode



Master receiver mode



Multi-master transmitter mode



Multi-master receiver mode



Slave transmitter mode



Slave receiver mode

These modes are described in the following chapters.

The Master is the device that starts a transfer, generates a clock and stops it.

The following registers have to be programmed before entering Master mode:

1.

DADR (+ IADRSZ + IADR if a 10 bit device is addressed): The device address is used to access slave devices in 
read or write mode.

2.

CKDIV + CHDIV + CLDIV: Clock Waveform.

3.

SVDIS: Disable the slave mode.

4.

MSEN: Enable the master mode.

Host with

TWI

Interface

TWD

TWCK

Atmel TWI

Serial EEPROM

I C RTC

I C LCD

Controller

Slave 1

Slave 2

Slave 3

VDD

I C Temp.

Sensor

Slave 4

Rp: Pull up value as given by the I C Standard

Rp

Rp