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15.3.2
Serial mode register 1 (SMR1)
The serial mode register 1 (SMR1) performs selecting operation mode, selecting baud
rate clock, and disabling/enabling of output of serial data and clock to pin.
I Serial mode register 1 (SMR1)
7
6
5
R/W
R/W
R/W
R/W
: Read/Write
: Reset value
Figure 15.3-3 Serial mode register 1 (SMR1)
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
bit0
SOE
bit1
SCKE
bit2
RST UART initialization bit
bit5
CS2 CS1 CS0
"000
bit7
MD1 MD0
Reset value
00000000
B
Serial data output enable bit (SOT1 pin)
General purpose I/O port
0
Serial data output of UART1
1
Serial clock I/O enable bit (SCK1 pin)
0
Clock input pin of general purpose I/O port or UART
1
Serial clock output pin of UART1
0
No effection
1
Initialization of all register in UART1
bit4
bit3
Clock input source select bit
"~"101
"
Baud rate by dedicated baud rate generator
B
B
Baud rate by internal timer
"110
"
B
(16-bit reload timer 1)
"111
"
Baud rate by external clock
B
bit6
Oerating mode select bit
Mode No.
0
0
Asynchronous mode (normal mode)
0
0
1
Multi processor mode
1
1
0
2
Synchronous mode
1
1
Setting disabled
CHAPTER 15 UART1
Operating mode
439
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