130
6174B–ATARM–07-Nov-05
AT91FR40162S Preliminary
17.10.2
USART Mode Register
Name:
US_MR
Access Type:
Read/Write
Reset Value:
0
Offset:
0x04
•
USCLKS: Clock Selection (Baud Rate Generator Input Clock)
•
CHRL: Character Length
Start, stop and parity bits are added to the character length.
• SYNC: Synchronous Mode Select (Code Label
US_SYNC
)
0 = USART operates in Asynchronous Mode.
1 = USART operates in Synchronous Mode.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
CLKO
MODE9
–
15
14
13
12
11
10
9
8
CHMODE
NBSTOP
PAR
SYNC
7
6
5
4
3
2
1
0
CHRL
USCLKS
–
–
–
–
USCLKS
Selected Clock
Code Label
US_CLKS
0
0
MCK
US_CLKS_MCK
0
1
MCK/8
US_CLKS_MCK8
1
X
External (SCK)
US_CLKS_SCK
CHRL
Character Length
Code Label
US_CHRL
0
0
Five bits
US_CHRL_5
0
1
Six bits
US_CHRL_6
1
0
Seven bits
US_CHRL_7
1
1
Eight bits
US_CHRL_8