411
Chapter 12
Asynchronous Serial Interface A (UARTA)
User’s Manual U16702EE3V2UD00
(4)
UARTAn option control register 0 (UAnOPT0)
The UAnOPT0 register is an 8-bit register that controls the serial transfer operation of UARTAn.
This register can be read or written in 8-bit or 1-bit units.
Reset input sets this register to 14H.
Figure 12-5:
UARTAn Option Control Register 0 (UAnOPT0)
Remarks: 1.
n = 0 to 1
2.
It is mandatory to write the fixed bits to the values given above to ensure proper opera-
tion.
Remark:
For details of the parity, refer to
12.5.9 Types and operation of parity
.
Address: UA0OPT0: FFFFFA03H, UA1OPT0: FFFFFA13H
After
Reset
Symbol
7
6
5
4
3
2
1
0
Address R/W
UAnOPT0
0
0
0
1
0
1
UAnTDL UAnRDL
R/W
14H
UAnTDL
Transmit data level control bit
0
Normal output of transfer data
1
Inverted output of transfer data
•
The value of the TXDAn bit can be inverted by the UAnTDL bit.
•
This bit can be set when the UAnPWR bit of the UAnCTL0 register = 0 or when the UAnTXE bit of the
UAnCTL0 register = 0.
UAnRDL
Receive data level control bit
0
Normal input of transfer data
1
Inverted input of transfer data
•
The value of the RXDAn pin can be inverted by the UAnRDL bit.
•
This bit can be set when the UAnPWR bit of the UAnCTL0 register = 0 or when the UAnRXE bit of the
UAnCTL0 register = 0.
electronic components distributor