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Chapter 32 USART (LIN / FIFO)
4.USART Registers
4.2 Serial Mode Register 04 (SMR04)
This register selects an operation mode and baud rate clock and specifies whether to enable output of serial
data and clocks to the corresponding pin.
Figure 4-2 Configuration of the Serial Mode register 04 (SMR04)
7
R/W R/W R/W R/W
R/W
:
W
:
:
624
6
5
4
3
2
1
W
W
R/W R/W
Readable and writable
Write only
Initial value
Initial value
0
0 0 0 0 0 0 0 0
B
bit0
SOE
0
disable SOT04 pin (high Z)
1
enable SOT04 pin (TxData)
bit1
SCKE
0
External Serial Clock Input
1
Internal Serial Clock Output
bit2
USART programmable clear (Software Reset)
UPCL
write
0
ignored
1
Reset USART
bit3
Restart dedicated Reload Counter
REST
write
0
ignored
1
Restart Counter
bit4
EXT
External Serial Clock Source enable
0
Use internal Baud Rate Generator (Reload Counter)
1
Use external Serial Clock Source
bit5
OTO
One-to-one external clock Input enable
0
Use ext. Clock with Baud Rate Generator (Reload C.)
1
Use external Clock as is
bit6
bit7
MD0
MD1
0
0
Mode 0: Asynchronous normal
1
0
Mode 1: Asynchronous Multiprocessor
0
1
Mode 2: Synchronous
1
1
Mode 3: Asynchronous LIN
Serial Output enable
Serial Clock Output enable
read
always 0
read
always 0
Operation Mode Setting
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