5 serial mode register (scsmr) – Renesas SH7781 User Manual
Page 1078
21. Serial Communication Interface with FIFO (SCIF)
Rev.1.00 Jan. 10, 2008 Page 1048 of 1658
REJ09B0261-0100
21.3.5
Serial Mode Register (SCSMR)
SCSMR is a 16-bit register used to set the SCIF's serial communication format and select the baud
rate generator clock source.
SCSMR can always be read from and written to by the CPU.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
15
14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CKS0
CKS1
⎯
STOP
O/
E
PE
CHR
C/
A
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
BIt:
Initial value:
R/W:
Bit Bit
Name
Initial
Value R/W
Description
15 to 8
—
All 0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
7 C/
A 0 R/W
Communication
Mode
Selects asynchronous mode or clocked synchronous
mode as the SCIF operating mode.
0: Asynchronous mode
1: Clocked synchronous mode
6 CHR
0 R/W
Character
Length
Selects 7 or 8 bits as the asynchronous mode data
length. In clocked synchronous mode, the data length is
fixed at 8 bits regardless of the CHR bit setting. When
7-bit data is selected, the MSB (bit 7) of SCFTDR is not
transmitted.
0: 8-bit data
1: 7-bit data