at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 437
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at91sam9260-cj
Manufacturer Part Number
at91sam9260-cj
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9260-CJ.pdf
(790 pages)
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Figure 32-8. Asynchronous Start Detection
Figure 32-9. Asynchronous Character Reception
32.6.3.3
6221G–ATARM–31-Jan-08
Synchronous Receiver
Clock (x16)
Baud Rate
Sampling
Sampling
Sampling
Baud Rate
Example: 8-bit, Parity Enabled
Detection
Clock
RXD
RXD
Start
Clock
RXD
transmitter can occur. Moreover, as soon as the stop bit is sampled, the receiver starts looking
for a new start bit so that resynchronization can also be accomplished when the transmitter is
operating with one stop bit.
Figure 32-8
operates in asynchronous mode.
In synchronous mode (SYNC = 1), the receiver samples the RXD signal on each rising edge of
the Baud Rate Clock. If a low level is detected, it is considered as a start. All data bits, the parity
bit and the stop bits are sampled and the receiver waits for the next start bit. Synchronous mode
operations provide a high speed transfer capability.
Configuration fields and bits are the same as in asynchronous mode.
Figure 32-10
1
1
2
2
samples
3
3
16
4
4
and
illustrates a character reception in synchronous mode.
D0
5
5
samples
16
Figure 32-9
6
6
D1
Detection
7
7
Rejection
samples
Start
Start
16
8
0
D2
1
1
samples
illustrate start detection and character reception when USART
16
2
2
3
3
D3
samples
4
4
16
5
D4
samples
6
16
7
D5
samples
8
16
9 10 11 12 13 14 15 16
D6
samples
16
D7
samples
16
Parity
Bit
samples
AT91SAM9260
16
Stop
Bit
Sampling
D0
437
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