AT91SAM7S32-AI ATMEL [ATMEL Corporation], AT91SAM7S32-AI Datasheet - Page 275

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

6071A–ATARM–28-Oct-04
Figure 106 and Figure 107 illustrate start detection and character reception when USART
operates in asynchronous mode.
Figure 106. Asynchronous Start Detection
Figure 107. Asynchronous Character Reception
Clock (x16)
Baud Rate
Sampling
Sampling
Sampling
Baud Rate
Example: 8-bit, Parity Enabled
Detection
Clock
RXD
RXD
Start
Clock
RXD
1
1
2
2
samples
3
3
16
4
4
D0
5
5
samples
16
6
6
D1
7
Detection
7
Rejection
samples
Start
Start
16
8
0
D2
1
1
AT91SAM7S32 Preliminary
samples
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
16
Stop
Bit
Sampling
D0
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