AT91SAM7S256D-AU Atmel, AT91SAM7S256D-AU Datasheet - Page 387

• Manufacturer Part Number: AT91SAM7S256D-AU
• Description: ARM Microcontrollers - MCU 256K Flash SRAM 64K ARM based MCU
• Manufacturer: Atmel
• Series: SAM7S256r

Specifications of AT91SAM7S256D-AU

• Rohs: yes
• Core: ARM
• Processor Series: AT91SAM
• Data Bus Width: 16 bit/32 bit
• Maximum Clock Frequency: 55 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 3 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: LQFP-64
• Mounting Style: SMD/SMT
• Interface Type: 2-Wire, I2S, SPI, USART
• Length: 7 mm

31.6.8.2
31.6.8.3
31.6.8.4
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
nected to the receiver input, thus the receiver remains active.
Figure 31-31. Automatic Echo Mode Configuration
Local loopback mode connects the output of the transmitter directly to the input of the receiver, as shown in
31-32. The TXD and RXD pins are not used. The RXD pin has no effect on the receiver and the TXD pin is contin-
uously driven high, as in idle state.
Figure 31-32. Local Loopback Mode Configuration
Remote loopback mode directly connects the RXD pin to the TXD pin, as shown in
and the receiver are disabled and have no effect. This mode allows bit-by-bit retransmission.
Figure 31-33. Remote Loopback Mode Configuration
Automatic Echo Mode
Local Loopback Mode
Remote Loopback Mode
Figure
31-31. Programming the transmitter has no effect on the TXD pin. The RXD pin is still con-
Transmitter
Transmitter
Transmitter
Receiver
Receiver
Receiver
1
1
RXD
TXD
RXD
TXD
RXD
TXD
SAM7S Series [DATASHEET]
Figure
6175M–ATARM–26-Oct-12
31-33. The transmitter
Figure
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