Rev. 2.0, 11/00, page 464 of 1037
23.2.9
Serial Interface Mode Register (SCMR1)
7
—
1
—
6
—
1
—
5
—
1
—
4
—
1
—
3
SDIR
0
R/W
0
SMIF
0
R/W
2
SINV
0
R/W
1
—
1
—
Bit :
Initial value :
R/W :
SCMR1 is an 8-bit readable/writable register used to select SCI1 functions.
SCMR1 is initialized to H'F2 by a reset, and in standby mode, watch mode, subactive mode,
subsleep mode, and module stop mode.
Bits 7 to 4: Reserved
These bits cannot be modified and are always read as 1.
Bit 3: Data Transfer Direction (SDIR)
Selects the serial/parallel conversion format.
Bit 3
SDIR
Description
0
TDR1 contents are transmitted LSB-first
(Initial value)
Receive data is stored in RDR1 LSB-first
1
TDR1 contents are transmitted MSB-first
Receive data is stored in RDR1 MSB-first
Bit 2: Data Invert (SINV)
Specifies inversion of the data logic level. The SINV bit does not affect the logic level of the
parity bit(s): parity bit inversion requires inversion of the O/
( bit in SMR1.
Bit 2
SINV
Description
0
TDR1 contents are transmitted without modification
(Initial value)
Receive data is stored in RDR1 without modification
1
TDR1 contents are inverted before being transmitted
Receive data is stored in RDR1 in inverted form
Summary of Contents for Hitachi H8S/2191
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