HD6412240 RENESAS [Renesas Technology Corp], HD6412240 Datasheet - Page 452

• Manufacturer Part Number: HD6412240
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 12 Serial Communication Interface (SCI)
12.2.5
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 standby mode or module stop mode.
Bit 7—Communication Mode (C/A A A A ): Selects asynchronous mode or clocked synchronous mode
as the SCI operating mode.
Bit 7
C/A A A A
0
1
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
0
1
Note:
Rev.3.00 Mar. 26, 2007 Page 410 of 772
REJ09B0355-0300
Bit
Initial value
R/W
* When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted, and it is not
Serial Mode Register (SMR)
possible to choose between LSB-first or MSB-first transfer.
Description
Asynchronous mode
Clocked 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