AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 330

• Manufacturer Part Number: AT91SAM7X128
• Description: MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
• Manufacturer: Atmel

Specifications of AT91SAM7X128

• Package: 100LQFP
• Device Core: ARM7TDMI
• Family Name: 91S
• Maximum Speed: 55 MHz
• Ram Size: 32 KB
• Program Memory Size: 128 KB
• Operating Supply Voltage: 1.8|3.3 V
• Data Bus Width: 32 Bit
• Program Memory Type: Flash
• Number Of Programmable I/os: 62
• Interface Type: CAN/Ethernet/SPI/I2S/TWI/USART/USB
• On-chip Adc: 8-chx10-bit
• Operating Temperature: -40 to 85 °C
• Number Of Timers: 3

30.6.8.2
30.6.8.3
30.6.8.4
330
AT91SAM7X512/256/128 Preliminary
Automatic Echo Mode
Local Loopback Mode
Remote Loopback Mode
Figure 30-28. Normal Mode Configuration
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 30-29. Automatic Echo Mode Configuration
Local loopback mode connects the output of the transmitter directly to the input of the receiver,
as shown in
the receiver and the TXD pin is continuously driven high, as in idle state.
Figure 30-30. Local Loopback Mode Configuration
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. The TXD and RXD pins are not used. The RXD pin has no effect on
Transmitter
Transmitter
Transmitter
Receiver
Receiver
Receiver
Figure
30-29. Programming the transmitter has no effect on
1
RXD
TXD
RXD
TXD
RXD
TXD
6120H–ATARM–17-Feb-09
Figure
30-31.