hd66100 Renesas Electronics Corporation., hd66100 Datasheet - Page 272

• Manufacturer Part Number: hd66100
• Description: H8/3867 Series
• Manufacturer: Renesas Electronics Corporation.

10.2.5
SMR is an 8-bit register used to set the serial data transfer format and to select the clock source for
the baud rate generator.
SMR can be read or written by the CPU at any time.
SMR is initialized to H'00 upon reset, and in standby, module standby, or watch mode.
Bit 7: Communication mode (COM)
Bit 7 selects whether SCI3 operates in asynchronous mode or synchronous mode.
Bit 7
COM
0
1
Bit 6: Character length (CHR)
Bit 6 selects either 7 or 8 bits as the data length to be used in asynchronous mode. In synchronous
mode the data length is always 8 bits, irrespective of the bit 6 setting.
Bit 6
CHR
0
1
Notes: 1. When 7-bit data is selected, the MSB (bit 7) of TDR is not transmitted.
Bit
Initial value
Read/Write
2. When 5-bit data is selected, set both PE and MP to 1. The three most significant bits
Serial mode register (SMR)
(bits 7, 6, and 5) of TDR are not transmitted.
Description
Asynchronous mode
Synchronous mode
Description
8-bit data/5-bit data
7-bit data
COM
R/W
7
0
*1
/5-bit data
CHR
R/W
6
0
*2
*2
R/W
PE
5
0
R/W
PM
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
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