Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK データシート

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SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

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 pro-
grammable as a master or a slave with sequential or single-byte access. Multiple master capability is supported. 20

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.

Below, 

2

C compat-

ible device.

Note:

1. START + b000000001 + Ack + Sr

• Compatibility with standard two-wire serial memory

• One, two or three bytes for slave address

• Sequential read/write operations

• Supports either master or slave modes

• Compatible with Standard Two-wire Serial Memories 

• Master, Multi-master and Slave Mode Operation 

• Bit Rate: Up to 400 Kbits 

• General Call Supported in Slave mode 

Atmel TWI compatibility with I

2

C Standard

Standard Mode Speed (100 KHz)

Supported

Fast Mode Speed (400 KHz)

Supported

7 or 10 bits Slave Addressing

Supported

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