AT91M55800A_0212 Datasheet, PDF (137/227 Pages) ATMEL Corporation – AT91 ARM Thumb Microcontrollers

USART Mode Register
Name:
US_MR
Access Type:
Read/Write
Reset State:
0
Offset:
0x04
31
30
29
28
27
–
–
–
–
–
23
22
21
20
19
–
–
–
–
–
15
14
13
12
11
CHMODE
NBSTOP
7
6
5
4
3
CHRL
USCLKS
–
• USCLKS: Clock Selection (Baud Rate Generator Input Clock)
USCLKS
0
0
0
1
1
X
Selected Clock
MCK
MCK/8
External (SCK)
• CHRL: Character Length
CHRL
0
0
0
1
1
0
1
1
Character Length
Five bits
Six bits
Seven bits
Eight bits
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.
• PAR: Parity Type
PAR
Parity Type
0
0
0
Even Parity
0
0
1
Odd Parity
0
1
0
Parity forced to 0 (Space)
0
1
1
Parity forced to 1 (Mark)
1
0
x
No parity
1
1
x
Multi-drop mode
AT91M55800A
26
–
18
CLKO
10
PAR
2
–
25
–
17
MODE9
9
1
–
24
–
16
–
8
SYNC
0
–
Code Label: US_CLKS
US_CLKS_MCK
US_CLKS_MCK8
US_CLKS_SCK
Code Label: US_CHRL
US_CHRL_5
US_CHRL_6
US_CHRL_7
US_CHRL_8
Code Label: US_PAR
US_PAR_EVEN
US_PAR_ODD
US_PAR_SPACE
US_PAR_MARK
US_PAR_NO
US_PAR_MULTIDROP
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