SAM7X128_14 Datasheet, PDF (307/662 Pages) ATMEL Corporation – ARM-based Flash MCU

Table 30-8 gives the maximum time-out period for some standard baud rates.
Table 30-8. Maximum Time-out Period
Baud Rate
bit/sec
600
1 200
2 400
4 800
9 600
14400
19200
28800
33400
56000
57600
200000
Bit Time
µs
1 667
833
417
208
104
69
52
35
30
18
17
5
Time-out
ms
109 225
54 613
27 306
13 653
6 827
4 551
3 413
2 276
1 962
1 170
1 138
328
30.6.3.9 Framing Error
The receiver is capable of detecting framing errors. A framing error happens when the stop bit of a received character is
detected at level 0. This can occur if the receiver and the transmitter are fully desynchronized.
A framing error is reported on the FRAME bit of the Channel Status Register (US_CSR). The FRAME bit is asserted in
the middle of the stop bit as soon as the framing error is detected. It is cleared by writing the Control Register (US_CR)
with the RSTSTA bit at 1.
Figure 30-15. Framing Error Status
Baud Rate
Clock
RXD
Write
US_CR
Start
Bit
D0
D1
D2
D3
D4
D5
D6
D7
Parity Stop
Bit Bit
RSTSTA = 1
FRAME
RXRDY
30.6.3.10 Transmit Break
The user can request the transmitter to generate a break condition on the TXD line. A break condition drives the TXD line
low during at least one complete character. It appears the same as a 0x00 character sent with the parity and the stop bits
at 0. However, the transmitter holds the TXD line at least during one character until the user requests the break condition
to be removed.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
307