HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 383
HD6417034B
Manufacturer Part Number
HD6417034B
Description
32-Bit RISC Microcomputer
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417034B.pdf
(687 pages)
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storage. RSR is then ready to receive the next data. This double buffering allows the SCI to
receive data continuously.
The CPU can read but not write to RDR. RDR is initialized to H'00 by a reset and in standby
mode.
13.2.3
The transmit shift register (TSR) transmits serial data. The SCI loads transmit data from the
transmit data register (TDR) into TSR, then transmits the data serially from the TxD pin, LSB (bit
0) first. After transmitting one data byte, the SCI automatically loads the next transmit data from
TDR into TSR and starts transmitting again. If the TDRE bit in SSR is 1, however, the SCI does
not load the TDR contents into TSR. The CPU cannot read or write to TSR directly.
13.2.4
The transmit data register (TDR) is an eight-bit register that stores data for serial transmission.
When the SCI detects that the transmit shift register (TSR) is empty, it moves transmit data written
in TDR into TSR and starts serial transmission. Continuous serial transmission is possible by
writing the next transmit data in TDR during serial transmission from TSR.
The CPU can always read and write to TDR. TDR is initialized to H'FF by a reset and in standby
mode.
Bit
Initial value
Read/Write
Bit
Read/Write
Bit
Initial value
Read/Write
Transmit Shift Register
Transmit Data Register
R/W
—
R
7
0
7
7
1
R/W
—
R
6
0
6
6
1
R/W
—
R
5
0
5
5
1
Section 13 Serial Communication Interface (SCI)
R/W
—
R
4
0
4
4
1
Rev. 7.00 Jan 31, 2006 page 357 of 658
R/W
—
R
3
0
3
3
1
R/W
—
R
2
0
2
2
1
REJ09B0272-0700
R/W
—
R
1
0
1
1
1
R/W
—
R
0
0
0
0
1
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