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13.2.5 Serial Mode Register (SMR)
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SMR is an 8-bit register that specifies the SCI serial communication format and selects the clock
source for the baud rate generator.
Bit
Initial value
Read/Write
Communication mode
Selects asynchronous or synchronous mode
The CPU can always read and write SMR. SMR is initialized to H'00 by a reset and in standby
mode.
7
6
5
C/A
CHR
PE
0
0
0
R/W
R/W
R/W
Parity enable
Selects whether a parity bit is added
Character length
Selects character length in asynchronous mode
4
3
2
O/E
STOP
MP
0
0
0
R/W
R/W
R/W
Multiprocessor mode
Selects the multiprocessor
function
Stop bit length
Selects the stop bit length
Parity mode
Selects even or odd parity
443
1
0
CKS1
CKS0
0
0
R/W
R/W
Clock select 1/0
These bits select the
baud rate generator's
clock source
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