Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
825
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
36.6.3 Interrupt
The TWI interface has an interrupt line connected to the Interrupt Controller. In order to handle interrupts, the
Interrupt Controller must be programmed before configuring the TWI.
Interrupt Controller must be programmed before configuring the TWI.
36.7
Functional Description
36.7.1 Transfer Format
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
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.
Figure 36-3.
START and STOP Conditions
Figure 36-4.
Transfer Format
36.7.2 Modes of Operation
The TWI has different 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 sections.
Table 36-5.
Peripheral IDs
Instance
ID
TWI0
17
TWI1
18
TWD
TWCK
Start
Stop
TWD
TWCK
Start
Address
R/W
Ack
Data
Ack
Data
Ack
Stop