H8S-2214 Datasheet, PDF (521/936 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2100 Series

12.2.5 Serial Mode Register (SMR)
Section 12 Serial Communication Interface (SCI)
Bit
:
7
6
5
4
3
2
1
0
C/A
CHR
PE
O/E STOP MP CKS1 CKS0
Initial value :
0
0
0
0
0
0
0
0
R/W
:
R/W
R/W R/W
R/W R/W R/W
R/W R/W
SMR is an 8-bit register used to set the SCI’s serial transfer format and select the baud rate
generator clock source.
SMR can be read or written to by the CPU at all times.
SMR is initialized to H'00 by a reset and in hardware standby mode. It retains its previous state in
module stop mode, software standby mode, watch mode, subactive mode, and subsleep mode.
Bit 7—Communication Mode (C/A): Selects asynchronous mode or clocked synchronous mode
as the SCI operating mode.
Bit 7
C/A
0
1
Description
Asynchronous mode
Clocked synchronous mode
(Initial value)
Bit 6—Character Length (CHR): Selects 7 or 8 bits as the data length in asynchronous mode. In
clocked synchronous mode, a fixed data length of 8 bits is used regardless of the CHR setting.
Bit 6
CHR
Description
0
8-bit data
1
7-bit data^*
(Initial value)
Note: * When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted, and it is not
possible to choose between LSB-first or MSB-first transfer.
Rev.4.00 Sep. 18, 2008 Page 461 of 872
REJ09B0189-0400