SAM3SD8C Atmel Corporation, SAM3SD8C Datasheet - Page 601

• Manufacturer Part Number: SAM3SD8C
• Manufacturer: Atmel Corporation

29. Two-wire Interface (TWI2)
29.1
29.2
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
Description
Embedded Characteristics
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. 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,
a full I
Table 29-1.
Note:
I
Standard Mode Speed (100 KHz)
Fast Mode Speed (400 KHz)
7 or 10 bits Slave Addressing
START BYTE
Repeated Start (Sr) Condition
ACK and NACK Management
Slope control and input filtering (Fast mode)
Clock stretching
Multi Master Capability
• Master, Multi-Master and Slave Mode Operation
• Compatibility with Atmel two-wire interface, serial memory and I
• One, two or three bytes for slave address
• Sequential read/write operations
• Bit Rate: Up to 400 kbit/s
• General Call Supported in Slave Mode
• Connection to PDC channel capabilities optimizes data transfers in Master Mode only
2
C Standard
– One channel for the receiver, one channel for the transmitter
– Next buffer support
2
C compatible device.
Table 29-1
1. START + b000000001 + Ack + Sr
(1)
Atmel TWI compatibility with I
lists the compatibility level of the Atmel Two-wire Interface in Master Mode and
2
C Standard
Atmel TWI
Supported
Supported
Supported
Not Supported
Supported
Supported
Not Supported
Supported
Supported
2
C compatible devices
SAM3S8/SD8
SAM3S8/SD8
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