CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
287
10.2.3 Control registers
(1) Asynchronous serial interface mode registers 00, 01, 10, 11 (ASIM00, ASIM01, ASIM10, ASIM11)
These registers specify the UART0 and UART1 transfer mode.
These registers can be read/written in 8- or 1-bit units.
7
TXE0
ASIM00
6
RXE0
5
PS01
4
PS00
3
CL0
2
SL0
1
SCLS01
0
SCLS00
FFFFF0D0H
TXE1
ASIM10
RXE1
PS11
PS10
CL1
SL1
SCLS11 SCLS10
80H
Address
FFFFF0C0H
After reset
80H
Bit Position
Bit Name
Function
Transmit/Receive Enable
Specifies the transmission/reception enable status/disable status.
TXEn
RXEn
Operation
0
0
Transmission/reception disabled (CSIn selected)
0
1
Reception enabled
1
0
Transmission enabled
1
1
Transmission/reception enabled
7, 6
TXEn,
RXEn
When reception is disabled, the receive shift register does not detect the start bit. The
receive buffer contents are held without shift-in processing or transmit processing to the
receive buffer being performed.
While in the reception enabled state, the receive shift operation is started in
synchronization with detection of the start bit and after 1 frame of data has been
received, the contents of the receive shift register are transmitted to the receive buffer.
Also, the reception complete interrupt (INTSRn) is generated in synchronization with
transmission to the receive buffer. The TXDn pin becomes high impedance when
transmission is disabled and a high level is output if it is not transmitting when
transmission is enabled.
Remark
n = 0, 1
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