Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

696

The Atmel Two-wire Interface (TWI) interconnects components on a unique two-wire bus, made up of one clock 

line and one data line with speeds of up to 400 Kbits per second, based on a byte-oriented transfer format. It can 

be used with any Atmel Two-wire Interface bus Serial EEPROM and I²C compatible device such as Real Time 

Clock (RTC), Dot Matrix/Graphic LCD Controllers and Temperature Sensor, to name but a few. The TWI is 

programmable as a master or a slave with sequential or single-byte access. Multiple master capability is 

supported.
Arbitration of the bus is performed internally and puts the TWI in slave mode automatically if the bus arbitration is 

lost.
A configurable baud rate generator permits the output data rate to be adapted to a wide range of core clock 

frequencies.

 lists the compatibility level of the Atmel Two-wire Interface in Master Mode and a full I

2

C compatible 

device.

Note:

1. START + b000000001 + Ack + Sr



2 TWIs



Compatible with Atmel Two-wire Interface Serial Memory and I²C Compatible Devices



One, Two or Three Bytes for Slave Address



Sequential Read-write Operations



Master, Multi-master and Slave Mode Operation



Bit Rate: Up to 400 Kbit/s



General Call Supported in Slave mode



SMBUS Quick Command Supported in Master Mode



Connection to Peripheral DMA Controller (PDC) Channel Capabilities Optimizes Data Transfers

̶

One Channel for the Receiver, One Channel for the Transmitter

Note:

1. See 

 for details on compatibility with I²C Standard.

Standard Mode Speed (100 kHz)

Supported

Fast Mode Speed (400 kHz)

Supported

7 or 10 bits Slave Addressing

Supported

START BYTE

Not Supported

Repeated Start (Sr) Condition

Supported

ACK and NACK Management

Supported

Slope control and input filtering (Fast mode)

Not Supported

Clock stretching

Supported

Multi Master Capability

Supported