Hitachi SH7751 Hardware Manual page 618

Bit 4—Receive Enable (RE): Enables or disables the start of serial reception by the SCI.
Bit 4: RE
0
1
Notes: *1 Clearing the RE bit to 0 does not affect the RDRF, FER, PER, and ORER flags, which
retain their states.
*2 Serial reception is started in this state when a start bit is detected in asynchronous
mode or serial clock input is detected in synchronous mode.
SCSMR1 setting must be performed to decide the receive format before setting the RE
bit to 1.
Bit 3—Multiprocessor Interrupt Enable (MPIE): Enables or disables multiprocessor interrupts.
The MPIE bit setting is only valid in asynchronous mode when the MP bit in SCSMR1 is set to 1.
The MPIE bit setting is invalid in synchronous mode or when the MP bit is cleared to 0.
Bit 3: MPIE
0
1
Note: * When receive data including MPB = 1 is received, the MPIE bit is cleared to 0 automatically,
and generation of RXI and ERI interrupts (when the TIE and RIE bits in SCSCR1 are set to
1) and FER and ORER flag setting is enabled.
Bit 2—Transmit-End interrupt Enable (TEIE): Enables or disables transmit-end interrupt
(TEI) request generation when there is no valid transmit data in SCTDR1 at the time for MSB data
transmission.
Bit 2: TEIE
0
1
Note: * TEI interrupt requests can be cleared by reading 1 from the TDRE flag in SCSSR1, then
clearing it to 0 and clearing the TEND flag to 0, or by clearing the TEIE bit to 0.
Description
Reception disabled*
2
Reception enabled*
Description
Multiprocessor interrupts disabled (normal reception performed) (Initial value)
[Clearing conditions]

When the MPIE bit is cleared to 0

When data with MPB = 1 is received
Multiprocessor interrupts enabled*
Description
Transmit-end interrupt (TEI) request disabled*
Transmit-end interrupt (TEI) request enabled*
1
(Initial value)
(Initial value)
Rev. 3.0, 04/02, page 579 of 1064