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HD6433636SW Datasheet(PDF) 240 Page - Renesas Technology Corp

Part # HD6433636SW
Description  8-Bit Microcomputer
PDF  418 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433636SW Datasheet(HTML) 240 Page - Renesas Technology Corp

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Transmit Data Register (TDR)
Bit
76543210
TDR7
TDR6
TDR5
TDR4
TDR3
TDR2
TDR1
TDR0
Initial value
11111111
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The transmit data register (TDR) is an 8-bit register for holding transmit data.
When SCI3 detects that the transmit shift register (TSR) is empty, it shifts transmit data written in
TDR to TSR and starts serial data transmission. While TSR is transmitting serial data, the next
byte to be transmitted can be written to TDR, realizing continuous transmission.
TDR can be read or written by the CPU at all times.
TDR is initialized to H'FF upon reset or in standby mode, watch mode, subactive mode, or
subsleep mode.
Serial Mode Register (SMR)
Bit
76543210
COM
CHR
PE
PM
STOP
MP
CKS1
CKS0
Initial value
00000000
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
The serial mode register (SMR) is an 8-bit register for setting the serial data communication
format and for selecting the clock source of the baud rate generator. SMR can be read and written
by the CPU at any time.
SMR is initialized to H'00 upon reset or in standby mode, watch mode, subactive mode, or
subsleep mode.
Bit 7—Communication Mode (COM): Bit 7 selects asynchronous mode or synchronous mode as
the serial data communication mode.
Bit 7: COM
Description
0
Asynchronous mode
(initial value)
1
Synchronous mode



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