HD6412320 RENESAS [Renesas Technology Corp], HD6412320 Datasheet - Page 634

• Manufacturer Part Number: HD6412320
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family H8S-2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 14 Serial Communication Interface (SCI)
14.2.5
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. In software standby mode
and module stop mode it retains its previous state.
Bit 7—Communication Mode (C/A): Selects asynchronous mode or synchronous mode as the
SCI operating mode.
Bit 7
C/A
0
1
Bit 6—Character Length (CHR): Selects 7 or 8 bits as the data length in asynchronous mode. In
synchronous mode, a fixed data length of 8 bits is used regardless of the CHR setting.
Bit 6
CHR
0
1
Note: * When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted, and it is not possible
Rev.6.00 Sep. 27, 2007 Page 604 of 1268
REJ09B0220-0600
Bit
Initial value :
R/W
to choose between LSB-first or MSB-first transfer.
Serial Mode Register (SMR)
Description
Asynchronous mode
Synchronous mode
Description
8-bit data
7-bit data *
:
:
R/W
C/A
7
0
CHR
R/W
6
0
R/W
PE
5
0
R/W
O/E
4
0
STOP
R/W
3
0
R/W
MP
2
0
CKS1
R/W
1
0
(Initial value)
(Initial value)
CKS0
R/W
0
0