AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 395

• Manufacturer Part Number: AT91RM9200-CI-002
• Description: IC ARM9 MCU 256 BGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91RM9200-CI-002

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 180MHz
• Connectivity: EBI/EMI, Ethernet, I²C, MMC, SPI, SSC, UART/USART, USB
• Peripherals: POR
• Number Of I /o: 122
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: ROM
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

29. Two-wire Interface (TWI)
29.1
29.2
29.3
1768I–ATARM–09-Jul-09
Overview
Block Diagram
Application 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 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 29-1. Block Diagram
Figure 29-2. Application Block Diagram
• Compatibility with standard two-wire serial memory
• One, two or three bytes for slave address
• Sequential Read/Write operations
Host with
Interface
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
AT91RM9200
R
TWCK
TWD
R
VDD
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