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H8SX/1663 数据表(PDF) 714 Page - Renesas Technology Corp

部件名 H8SX/1663
功能描述  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8SX/1663 数据表(HTML) 714 Page - Renesas Technology Corp

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Section 15 Serial Communication Interface (SCI, IrDA, CRC)
Rev.1.00 Jun. 07, 2006 Page 662 of 1102
REJ09B0294-0100
15.3.3
Transmit Data Register (TDR)
TDR is an 8-bit register that stores transmit data. When the SCI detects that TSR is empty, it
transfers the transmit data written in TDR to TSR and starts transmission. The double-buffered
structures of TDR and TSR enable continuous serial transmission. If the next transmit data has
already been written to TDR when one frame of data is transmitted, the SCI transfers the written
data to TSR to continue transmission. Although TDR can be read from or written to by the CPU at
all times, to achieve reliable serial transmission, write transmit data to TDR for only once after
confirming that the TDRE bit in SSR is set to 1.
Bit
Bit Name
Initial Value
R/W
7
1
R/W
6
1
R/W
5
1
R/W
4
1
R/W
3
1
R/W
2
1
R/W
1
1
R/W
0
1
R/W
15.3.4
Transmit Shift Register (TSR)
TSR is a shift register that transmits serial data. To perform serial data transmission, the SCI first
automatically transfers transmit data from TDR to TSR, and then sends the data to the TxD pin.
TSR cannot be directly accessed by the CPU.
15.3.5
Serial Mode Register (SMR)
SMR is used to set the SCI's serial transfer format and select the baud rate generator clock source.
Some bits in SMR have different functions in normal mode and smart card interface mode.
• When SMIF in SCMR = 0
7
C/
A
0
R/W
6
CHR
0
R/W
5
PE
0
R/W
4
O/
E
0
R/W
3
STOP
0
R/W
2
MP
0
R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Bit
Bit Name
Initial Value
R/W
• When SMIF in SCMR = 1
7
GM
0
R/W
6
BLK
0
R/W
5
PE
0
R/W
4
O/
E
0
R/W
3
BCP1
0
R/W
2
BCP0
0
R/W
1
CKS1
0
R/W
0
CKS0
0
R/W
Bit
Bit Name
Initial Value
R/W



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