443
Bit 3—Multiprocessor Interrupt Enable (MPIE): Enables or disables multiprocessor interrupts.
The MPIE setting is used only in asynchronous mode, and only if the multiprocessor mode bit
(MP) in the serial mode register (SCSMR) is set to 1 during reception. The MPIE setting is
ignored in synchronous mode or when the MP bit is cleared to 0.
Bit 3: MPIE
Description
0
Multiprocessor interrupts are disabled (normal receive operation)
(Initial value)
[Clearing conditions]
(1) MPE is cleared to 0 when MPIE is cleared to 0.
(2) The multiprocessor bit (MPB) is set to 1 in receive data.
1
Multiprocessor interrupts are enabled
*
Receive-data-full interrupt requests (RXI), receive-error interrupt requests (ERI),
and setting of the RDRF, FER, and ORER status flags in the serial status register
(SCSSR) are disabled until data with a multiprocessor bit of 1 is received.
Note:
*
The SCI does not transfer receive data from SCRSR to SCRDR, does not detect receive
errors, and does not set the RDRF, FER, and ORER flags in the serial status register
(SCSSR). When it receives data that includes MPB
=
1, the SCSSR’s MPB flag is set to 1,
and the SCI automatically clears MPIE to 0, generates RXI and ERI interrupts (if the TIE
and RIE bits in the SCSCR are set to 1), and allows the FER and ORER bits to be set.
Bit 2—Transmit-End Interrupt Enable (TEIE): Enables or disables the transmit-end interrupt
(TEI) requested if SCTDR does not contain new transmit data when the MSB is transmitted.
Bit 2: TEIE
Description
0
Transmit-end interrupt (TEI) requests are disabled
*
(Initial value)
1
Transmit-end interrupt (TEI) requests are enabled
*
Note:
*
The TEI request can be cleared by reading the TDRE bit in the serial status register
(SCSSR) after it has been set to 1, then clearing TDRE to 0 and clearing the transmit end
(TEND) bit to 0, or by clearing the TEIE bit to 0.
Summary of Contents for SH7709S
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