at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 483

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

32. Two-wire Interface (TWI)
32.1
32.2
Figure 32-1. Block Diagram
6249D–ATARM–20-Dec-07
Description
Block Diagram
The 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-ori-
ented 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 master transmitter or
master receiver with sequential or single-byte access. A configurable baud rate generator per-
mits the output data rate to be adapted to a wide range of core clock frequencies. Below,
32-1
Table 32-1.
Notes:
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 strectching
2
PMC
APB Bridge
C Standard
lists the compatibility level of the Atmel Two-wire Interface and a full I
1. START + b000000001 + Ack + Sr
2. A repeated start condition is only supported in Master Receiver mode. See
MCK
“Internal Address” on page 487
(1)
Atmel TWI compatibility with i2C Standard
Two-wire
Interface
Interrupt
TWI
AT91SAM9263 Preliminary
PIO
Atmel TWI
Supported
Supported
Supported
Not Supported
Not Fully Supported
Supported
Not Supported
Supported
AIC
TWCK
TWD
(2)
2
C compatible device.
Section 32.5.5
Table
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