RX610 Group
20. Serial Communications Interface (SCI)
R01UH0032EJ0120 Rev.1.20
Page 620 of 1006
Feb 20, 2013
Bit
Symbol
Bit Name
Function
R/W
b1, b0
CKE[1:0] Clock Enable
•
For SCI5 and SCI6
Asynchronous mode
b1 b0
0 0: On-chip baud rate generator
The SCKn pin functions as I/O port.
0 1: On-chip baud rate generator
The clock with the same frequency as the bit rate is output from
the SCKn pin.
1 0: External clock or TMR clock
•
When an external clock is used, the clock with a frequency 16
times the bit rate should be input from the SCKn pin.
(When the SEMR.ABCS bit is 1, the clock with a frequency 8
times the bit rate should be input.)
•
The TMR clock can be used.
1 1: External clock or TMR clock
•
When an external clock is used, the clock with a frequency 16
times the bit rate should be input from the SCKn pin.
(When the SEMR.ABCS bit is 1, the clock with a frequency 8
times the bit rate should be input.)
•
The TMR clock can be used.
Clock synchronous mode
b1 b0
0 0: Internal clock
The SCKn pin functions as the clock output pin.
0 1: Internal clock
The SCKn pin functions as the clock output pin.
1 0: External clock
The SCKn pin functions as the clock input pin.
1 1: External clock
The SCKn pin functions as the clock input pin.
R/W
*
1
b2
TEIE
Transmit End Interrupt Enable
0: A TEI interrupt request is disabled
1: A TEI interrupt request is enabled
R/W
b3
Reserved
This bit is read as 0. The write value should be 0.
R/W
b4
RE
Receive Enable
0: Serial reception is disabled
1: Serial reception is enabled
R/W
*
2
b5
TE
Transmit Enable
0: Serial transmission is disabled
1: Serial transmission is enabled
R/W
*
2
b6
RIE
Receive Interrupt Enable
0: RXI and ERI interrupt requests are disabled
1: RXI and ERI interrupt requests are enabled
R/W
b7
TIE
Transmit Interrupt Enable
0: A TXI interrupt request is disabled
1: A TXI interrupt request is enabled
R/W
Notes: 1. Writable only when TE = 0 and RE = 0.
2. A 1 can be written only when TE = 0 and RE = 0. After setting TE or RE to 1, only 0 can be written in TE and RE.
SCR is a register that enables or disables the SCI transfer operations and selects the transfer clock source.