AT91RM3400-DK Atmel, AT91RM3400-DK Datasheet - Page 251

• Manufacturer Part Number: AT91RM3400-DK
• Description: KIT DEV FOR AT91RM3400
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91RM3400-DK

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT91RM3400
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• For Use With/related Products: AT91RM3400
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Two-wire Interface (TWI)
Overview
Block Diagram
Application Block Diagram
1790A–ATARM–11/03
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-
oriented transfer format. It can be used with any Atmel two-wire bus serial EEPROM. The TWI
is programmable as a master with sequential or single-byte access.
A configurable baud rate generator permits the output data rate to be adapted to a wide range
of core clock frequencies.
The main features of the TWI are:
•
•
•
Figure 79. Block Diagram
Figure 80. Application Block Diagram
Host with
Interface
Compatibility with standard two-wire serial memory
One, two or three bytes for slave address
Sequential read/write operations
TWI
TWCK
TWD
PMC
APB Bridge
AT24LC16
Slave 1
MCK
U1
Two-wire
Interface
Slave 2
AT24LC16
U2
Interrupt
TWI
LCD Controller
Slave 3
U3
PIO
AIC
AT91RM3400
R
TWCK
TWD
R
VDD
251