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HD6433644R Datasheet(PDF) 314 Page - Renesas Technology Corp

Part # HD6433644R
Description  8-Bit Single-Chip Microcomputer
PDF  549 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433644R Datasheet(HTML) 314 Page - Renesas Technology Corp

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Section 10 Serial Communication Interface
Rev. 6.00 Sep 12, 2006 page 294 of 526
REJ09B0326-0600
Transmit Data Register (TDR)
Bit
7
6
5
4
3
2
1
0
TDR7
TDR6
TDR5
TDR4
TDR3
TDR2
TDR1
TDR0
Initial value
1
1
1
1
1
1
1
1
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
TDR is an 8-bit register that stores transmit data. When TSR is found to be empty, the transmit
data written in TDR is transferred to TSR, and serial data transmission is started. Continuous
transmission is possible by writing the next transmit data to TDR during TSR serial data
transmission.
TDR can be read or written by the CPU at any time.
TDR is initialized to H'FF upon reset, and in standby, watch, subactive, or subsleep mode.
Serial Mode Register (SMR)
Bit
7
6
5
4
3
2
1
0
COM
CHR
PE
PM
STOP
MP
CKS1
CKS0
Initial value
0
0
0
0
0
0
0
0
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
SMR is an 8-bit register used to set the serial data transfer format and to select the clock source for
the baud rate generator.
SMR can be read or written by the CPU at any time.
SMR is initialized to H'00 upon reset, and in standby, watch, subactive, or subsleep mode.
Bit 7
Communication Mode (COM): Bit 7 selects whether SCI3 operates in asynchronous
mode or synchronous mode.
Bit 7: COM
Description
0
Asynchronous mode
(initial value)
1
Synchronous mode



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