AT91RM9200-CI-002 Atmel, AT91RM9200-CI-002 Datasheet - Page 436

• 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: -

30.6.8.2
30.6.8.3
30.6.8.4
436
AT91RM9200
Automatic Echo
Local Loopback
Remote Loopback
Automatic echo mode allows bit-by-bit retransmission. When a bit is received on the RXD pin, it
is sent to the TXD pin, as shown in
the TXD pin. The RXD pin is still connected to the receiver input, thus the receiver remains
active.
Figure 30-28. Automatic Echo
The local loopback mode connects the output of the transmitter directly to the input of the
receiver, as shown in
effect on the receiver and the TXD pin is continuously driven high, as in idle state.
Figure 30-29. Local Loopback
Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in
The transmitter and the receiver are disabled and have no effect. This mode allows bit-by-bit
retransmission.
Figure 30-30. Remote Loopback
Figure
30-29. The TXD and RXD pins are not used. The RXD pin has no
Transmitter
Transmitter
Transmitter
Receiver
Receiver
Receiver
Figure
30-28. Programming the transmitter has no effect on
1
1
RXD
TXD
RXD
TXD
RXD
TXD
1768I–ATARM–09-Jul-09
Figure
30-30.