SAM7S256_14 Datasheet, PDF (715/775 Pages) ATMEL Corporation – ARM-based Flash MCU

40.20.8.4 USART: XOFF Character Bad Behavior
The XOFF character is sent only when the receive buffer is detected full. While the XOFF is being sent, the remote
transmitter is still transmitting. As only one Holding register is available in the receiver, characters will be lost in
reception. This makes the software handshaking functionality ineffective.
Problem Fix/Workaround
None.
40.20.8.5 USART: DCD is active High instead of Low
The DCD signal is active at High level in the USART Modem Mode.
DCD should be active at Low level.
Problem Fix/Workaround
Add an inverter.
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
715