8 usart transmit holding register – Rainbow Electronics AT91CAP9S250A User Manual
Page 571
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571
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
35.7.8
USART Transmit Holding Register
Name:
US_THR
Access Type:
Write-only
• TXCHR: Character to be Transmitted
Next character to be transmitted after the current character if TXRDY is not set.
• TXSYNH: Sync Field to be transmitted
0: The next character sent is encoded as a data. Start Frame Delimiter is DATA SYNC.
1: The next character sent is encoded as a command. Start Frame Delimiter is COMMAND SYNC.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
TXSYNH
–
–
–
–
–
–
TXCHR
7
6
5
4
3
2
1
0
TXCHR
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