h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 470

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 Serial Communication Interface (SCI)
13.2.5
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.
Bit 7—Communication Mode (C/A A A A ): Selects asynchronous mode or clocked synchronous mode
as the SCI operating mode.
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.
Note: * When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted, and it is not possible
Rev. 5.00 Sep 22, 2005 page 444 of 1136
REJ09B0257-0500
Bit 7
C/A A A A
0
1
Bit 6
CHR
0
1
Bit
Initial value
R/W
to choose between LSB-first or MSB-first transfer.
Serial Mode Register (SMR)
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