HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 566

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

14.2.3
The transmit shift register (SCTSR) is the register used to transmit serial data.
To perform serial data transmission, the SCIF first transfers transmit data from SCFTDR to
SCTSR, then sends the data to the TxD pin starting with the LSB (bit 0) or MSB (bit 7).
When transmission of one byte is completed, the next transmit data is transferred from SCFTDR
to SCTSR, and transmission started, automatically.
SCTSR cannot be read or written to directly.
14.2.4
The transmit FIFO data register (SCFTDR) is a 16-stage FIFO register (8 bits per stage) that stores
data for serial transmission.
When the SCIF detects that SCTSR is empty, it transfers the transmit data written in SCFTDR to
SCTSR and starts serial transmission. Serial transmission is performed continuously until there is
no transmit data left in SCFTDR.
SCFTDR is a write-only register, and cannot be read.
The next data cannot be written when SCFTDR is filled with 16 bytes of transmit data. Data
written in this case is ignored.
14.2.5
Initial value:
Transmit Shift Register (SCTSR)
Transmit FIFO Data Register (SCFTDR)
Serial Mode Register (SCSMR)
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
R/W
C/A
—
W
7
7
7
0
CHR/
ICK3
R/W
—
W
6
6
6
0
ICK2
R/W
PE/
—
W
5
5
5
0
O/E/
ICK1
R/W
—
W
4
4
4
0
STOP/
ICK0
R/W
—
W
3
3
3
0
R/W
MP
—
W
2
2
2
0
CKS1
R/W
—
W
1
1
1
0
CKS0
R/W
—
W
0
0
0
0
553