Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK Hoja De Datos

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SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The TWI interface has an interrupt line connected to the Advanced Interrupt Controller (AIC). In order to handle
interrupts, the AIC must be programmed before configuring the TWI.

The data put on the TWD line must be 8 bits long. Data is transferred MSB first; each byte must be followed by an
acknowledgement. The number of bytes per transfer is unlimited (see 

Each transfer begins with a START condition and terminates with a STOP condition (see 

• A high-to-low transition on the TWD line while TWCK is high defines the START condition.

• A low-to-high transition on the TWD line while TWCK is high defines a STOP condition.

 START and STOP Conditions 

Transfer Format

The TWI has six 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.

Peripheral IDs

TWI0

12

TWI1

13

TWD

TWCK

Start

Stop

TWD

TWCK

Start

Address

R/W

Ack

Data

Ack

Data

Ack

Stop