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1745D–ATARM–04-Nov-05
AT91M55800A
18.10.2 USART Mode Register
Name: US_MR
Access Type: Read/Write
Reset State: 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.
• PAR: Parity Type
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
PAR Parity Type Code Label: US_PAR
0 0 0 Even Parity US_PAR_EVEN
0 0 1 Odd Parity US_PAR_ODD
0 1 0 Parity forced to 0 (Space) US_PAR_SPACE
0 1 1 Parity forced to 1 (Mark) US_PAR_MARK
1 0 x No parity US_PAR_NO
1 1 x Multi-drop mode US_PAR_MULTIDROP