h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 448

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
15.2.5
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, watch mode, subactive mode, subsleep
mode, and module stop mode.
Bit 7—Communication Mode (C/A A A A ): Selects asynchronous mode or 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
synchronous mode, a fixed data length of 8 bits is used regardless of the CHR setting.
Bit 6
CHR
0
1
Note:
Rev. 4.00 Jun 06, 2006 page 394 of 1004
REJ09B0301-0400
Bit
Initial value
Read/Write
* When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted, and LSB-
Serial Mode Register (SMR)
first/MSB-first selection is not available.
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