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CHAPTER 10 UART
10.4 Serial Input Data Register (SIDR) and Serial Output Data
Register (SODR)
The serial input data register (SIDR) is a data buffer register for receiving data, and the
serial output data register (SODR) is a data buffer register for transmitting data.
When 7-bit data is used, bit 7 (D7) is invalid. Write to the SODR register when TDRE of
the SSR register is "1".
Configuration of Serial Input Data Register (SIDR) and Serial Output Data Register (SODR)
The configuration of the serial input data register (SIDR) and serial output data register (SODR)
is shown below:
SIDR 00001D
Address: 000021
000025
SODR
Address: same as above
<Note>
An instruction to write to the above address means to write to the SODR register, and an
instruction to read from the above address means to read the SIDR register.
252
7
6
H
D7
D6
H
H
R
R
7
6
D7
D6
W
W
5
4
3
2
D5
D4
D3
D2
R
R
R
R
5
4
3
2
D5
D4
D3
D2
W
W
W
W
Initial value
1
0
D1
D0
Undefined
R
R
1
0
Undefined
D1
D0
W
W
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