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SMR—Serial Mode Register
Bit
Initial value
Read/Write
Communication mode
0 Asynchronous mode
1 Synchronous mode
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7
6
A
C/
CHR
0
0
R/W
R/W
Multiprocessor mode
0 Multiprocessor function disabled
1 Multiprocessor format selected
Stop bit length
0 One stop bit
1 Two stop bits
Parity mode
0 Even parity
1 Odd parity
Parity enable
0 Parity bit is not added or checked
1 Parity bit is added and checked
Character length
0 8-bit data
1 7-bit data
H'B0
5
7
3
E
PE
O/
STOP
MP
0
0
0
R/W
R/W
R/W
R/W
Clock select 1 and 0
Bit 1
CKS1
0
1
510
SCI
2
1
0
CKS1
CKS0
0
0
0
R/W
R/W
Bit 0
CKS0
Clock Source
0
ø clock
1
ø/4 clock
0
ø/16 clock
1
ø/64 clock
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