SH7080 Datasheet, PDF (800/1644 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family

Section 15 Serial Communication Interface (SCI)
15.3.9 Serial Direction Control Register (SCSDCR)
The DIR bit in the serial direction control register (SCSDCR) selects LSB-first or MSB-first
transfer. With an 8-bit data length, LSB-first/MSB-first selection is available regardless of the
communication mode.
Bit: 7
6
5
4
3
2
1
0
-
-
-
-
DIR
-
-
-
Initial value: 1
1
1
1
0
0
1
0
R/W: R
R
R
R R/W R
R
R
Bit Bit Name
7 to 4 
Initial
Value
All 1
3
DIR
0
2

0
1

1
0

0
R/W Description
R
Reserved
These bits are always read as 1. The write value should
always be 1.
R/W Data Transfer Direction
Selects the serial/parallel conversion format. Valid for
an 8-bit transmit/receive format.
0: SCTDR contents are transmitted in LSB-first order
Receive data is stored in SCRDR in LSB-first
1: SCTDR contents are transmitted in MSB-first order
Receive data is stored in SCRDR in MSB-first
R
Reserved
This bit is always read as 0. The write value should
always be 0.
R
Reserved
This bit is always read as 1. The write value should
always be 1.
R
Reserved
This bit is always read as 0. The write value should
always be 0.
Rev. 3.00 May 17, 2007 Page 742 of 1582
REJ09B0181-0300