HD6432646 Hitachi, HD6432646 Datasheet - Page 472
HD6432646
Manufacturer Part Number
HD6432646
Description
(HD64F264x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432646.pdf
(1155 pages)
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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): Selects asynchronous mode or clocked 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
clocked 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
438
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
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