Datasheet

492
SAM9M10 [DATASHEET]
6355F–ATARM–12-Mar-13
Figure 31-24. Receiver Time-out Block Diagram
Table 31-11 gives the maximum time-out period for some standard baud rates.
31.7.3.13 Framing Error
The receiver is capable of detecting framing errors. A framing error happens when the stop bit of a received char-
acter 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.
16-bit Time-out
Counter
0
TO
TIMEOUT
Baud Rate
Clock
=
Character
Received
RETTO
Load
Clock
16-bit
Value
STTTO
DQ
1
Clear
Table 31-11. Maximum Time-out Period
Baud Rate Bit Time Time-out
bit/sec μs ms
600 1 667 109 225
1 200 833 54 613
2 400 417 27 306
4 800 208 13 653
9 600 104 6 827
14400 69 4 551
19200 52 3 413
28800 35 2 276
33400 30 1 962
56000 18 1 170
57600 17 1 138
200000 5 328