SH7760 Datasheet, PDF (884/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

23.3.4 Transmit Buffer Register (SPTBR)
SPTBR is a 32-bit readable/writable register that stores data to be transmitted.
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Initial value: -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
R/W: R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Bit: 15 14 13 12 11 10 9
-
-
-
-
-
-
-
Initial value: -
-
-
-
-
-
-
R/W: R
R
R
R
R
R
R
8
7
6
5
4
3
2
1
0
-
TD
-
0
0
0
0
0
0
0
0
R R/W R/W R/W R/W R/W R/W R/W R/W
Bit
Bit Name
31 to 8 
Initial Value R/W
All 
R
7 to 0 TD
All 0
R/W
Description
Reserved
These bits are always read as an undefined
value. The write value should always be 0.
Transmit Data
Data written to this register is transferred to the
shift register for transmission.
When reading these bits, always read as data
stored in the transmit buffer.
Rev. 1.0, 02/03, page 834 of 1294