AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 280

• Manufacturer Part Number: AT91SAM7S32-AI
• Description: AT91 ARM Thumb-based Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

Framing Error
280
AT91SAM7S32 Preliminary
Figure 112. Receiver Time-out Block Diagram
Table 65 gives the maximum time-out period for some standard baud rates.t
Table 65. Maximum Time-out Period
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.
RETTO
Character
Received
STTTO
Baud Rate
200000
bit/sec
14400
19200
28800
33400
56000
57600
1 200
2 400
4 800
9 600
600
1
D
Clear
Q
Baud Rate
Clock
Clock
Bit Time
1 667
833
417
208
104
µs
69
52
35
30
18
17
5
16-bit Time-out
Counter
TO
Load
16-bit
Value
0
Time-out
109 225
6071A–ATARM–28-Oct-04
54 613
27 306
13 653
6 827
4 551
3 413
2 276
1 962
1 170
1 138
328
=
ms
TIMEOUT