HD64F2149 Datasheet, PDF (454/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Bit 4—Receive Enable (RE): Enables or disables the start of serial reception by the SCI.
Bit 4
RE
Description
0
Reception disabled*¹
(Initial value)
1
Reception enabled*²
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.
SMR setting must be performed to decide the reception 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 receiving with the MP bit in SMR
set to 1.
The MPIE bit setting is invalid in synchronous mode or when the MP bit is cleared to 0.
Bit 3
MPIE
Description
0
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
1
Multiprocessor interrupts enabled*
Receive interrupt (RXI) requests, receive-error interrupt (ERI) requests, and setting
of the RDRF, FER, and ORER flags in SSR are disabled until data with the
multiprocessor bit set to 1 is received.
Note: * When receive data including MPB = 0 is received, receive data transfer from RSR to RDR,
receive error detection, and setting of the RDRF, FER, and ORER flags in SSR , is not
performed. When receive data with MPB = 1 is received, the MPB bit in SSR is set to 1, the
MPIE bit is cleared to 0 automatically, and generation of RXI and ERI interrupts (when the
TIE and RIE bits in SCR 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 if there is no valid transmit data in TDR when the MSB is transmitted.
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