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SMR—Serial Mode Register
7
Bit
C/A
Initial value
0
Read/Write
R/W
Communication mode (for serial communication interface)
0
1
GSM mode (for smart card interface)
0
1
Note: * etu: Elementary time unit (time required to transmit one bit)
6
5
CHR
PE
0
0
R/W
R/W
Parity enable
0
1
Character length
8-bit data
0
1
7-bit data
Asynchronous mode
Synchronous mode
TEND flag is set 12.5 etu* after start bit
TEND flag is set 11.0 etu* after start bit
4
3
O/E
STOP
0
0
R/W
R/W
Stop bit length
0
1
Parity mode
Even parity
0
1
Odd parity
Parity bit is not added or checked
Parity bit is added and checked
H'FFFB0
2
1
MP
CKS1
0
0
R/W
R/W
Clock select 1 and 0
Bit 1
Bit 0
CKS1
CKS0
0
0
1
0
1
1
Multiprocessor mode
0
Multiprocessor function disabled
Multiprocessor format selected
1
One stop bit
Two stop bits
SCI0
0
CKS0
0
R/W
Clock Source
φ clock
φ/4 clock
φ/16 clock
φ/64 clock
571
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