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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)
76543210
Initial value
0 0 0 0 0 0 0 0
B
R/W R/W R/W R/W WW R/W R/W
bit0
SOE Serial Output enable
0 disable SOT04 pin (high Z)
1 enable SOT04 pin (TxData)
bit1
SCKE Serial Clock Output enable
0 External Serial Clock Input
1 Internal Serial Clock Output
bit2
UPCL
USART programmable clear (Software Reset)
write read
0 ignored
always 0
1 Reset USART
bit3
REST
Restart dedicated Reload Counter
write read
0 ignored
always 0
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 Operation Mode Setting
0 0 Mode 0: Asynchronous normal
1 0 Mode 1: Asynchronous Multiprocessor
0 1 Mode 2: Synchronous
1 1 Mode 3: Asynchronous LIN
R/W : Readable and writable
W : Write only
: Initial value