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The CPU can always read and write SCR. SCR is initialized to H'00 by a reset and in standby
mode.
Bit 7—Transmit Interrupt Enable (TIE): Enables or disables the transmit-data-empty interrupt
(TXI) requested when the TDRE flag in SSR is set to 1 due to transfer of serial transmit data from
TDR to TSR.
Bit 7
TIE
0
1
Note: * TXI interrupt requests can be cleared by reading the value 1 from the TDRE flag, then
clearing it to 0; or by clearing the TIE bit to 0.
Bit 6—Receive Interrupt Enable (RIE): Enables or disables the receive-data-full interrupt (RXI)
requested when the RDRF flag in SSR is set to 1 due to transfer of serial receive data from RSR to
RDR; also enables or disables the receive-error interrupt (ERI).
Bit 6
RIE
0
1
Note: * RXI and ERI interrupt requests can be cleared by reading the value 1 from the RDRF, FER,
PER, or ORER flag, then clearing the flag to 0; or by clearing the RIE bit to 0.
Bit 5—Transmit Enable (TE): Enables or disables the start of SCI serial transmitting operations.
Bit 5
TE
0
1
Notes: 1. The TDRE flag is fixed at 1 in SSR.
2. In the enabled state, serial transmission starts when the TDRE flag in SSR is cleared to
0 after writing of transmit data into TDR. Select the transmit format in SMR before
setting the TE bit to 1.
Bit 4—Receive Enable (RE): Enables or disables the start of SCI serial receiving operations.
368
Description
Transmit-data-empty interrupt request (TXI) is disabled*
Transmit-data-empty interrupt request (TXI) is enabled
Description
Receive-data-full (RXI) and receive-error (ERI) interrupt requests are disabled*
Receive-data-full (RXI) and receive-error (ERI) interrupt requests are enabled
Description
Transmitting disabled*
Transmitting enabled*
1
2
(Initial value)
(Initial value)
(Initial value)
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