SAM3N0B Atmel Corporation, SAM3N0B Datasheet - Page 467

• Manufacturer Part Number: SAM3N0B
• Manufacturer: Atmel Corporation

28.7
28.7.1
28.7.2
11011A–ATARM–04-Oct-10
11011A–ATARM–04-Oct-10
Functional Description
Transfer Format
Modes of Operation
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
28-4).
Each transfer begins with a START condition and terminates with a STOP condition (see
28-3).
Figure 28-3.
Figure 28-4. Transfer Format
The TWI has six modes of operations:
These modes are described in the following chapters.
• 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.
• Master transmitter mode
• Master receiver mode
• Multi-master transmitter mode
• Multi-master receiver mode
• Slave transmitter mode
• Slave receiver mode
TWD
TWCK
START and STOP Conditions
Start
Address
TWCK
TWD
R/W
Start
Ack
Data
Ack
Data
Stop
Ack
Stop
SAM3N
SAM3N
Figure
Figure
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