Rev. 3.0, 10/02, page 409 of 686
Table 13.10 SCI Interrupt Sources
Channel Name
Interrupt Source
Interrupt Flag
DTC
Activation
DMAC
Activation
Priority
*
ERI0
Receive Error
ORER, FER, PER Not possible Not possible High
RXI0
Receive Data Full
RDRF
Possible
Possible
TXI0
Transmit Data Empty TDRE
Possible
Possible
0
TEI0
Transmission End
TEND
Not possible Not possible
ERI1
Receive Error
ORER, FER, PER Not possible Not possible
RXI1
Receive Data Full
RDRF
Possible
Possible
TXI1
Transmit Data Empty TDRE
Possible
Possible
1
TEI1
Transmission End
TEND
Not possible Not possible
ERI2
Receive Error
ORER, FER, PER Not possible Not possible
RXI2
Receive Data Full
RDRF
Possible
Not possible
TXI2
Transmit Data Empty TDRE
Possible
Not possible
2
TEI2
Transmission End
TEND
Not possible Not possible Low
Note:
*
This table shows the initial state immediately after a reset. The relative channel priorities
can be changed by the interrupt controller.
13.9
Usage Notes
13.9.1
Break Detection and Processing (Asynchronous Mode Only)
When framing error detection is performed, a break can be detected by reading the RxD pin value
directly. In a break, the input from the RxD pin becomes all 0s, setting the FER flag, and possibly
the PER flag. Note that as the SCI continues the receive operation after receiving a break, even if
the FER flag is cleared to 0, it will be set to 1 again.
13.9.2
Mark State and Break Detection (Asynchronous Mode Only)
When TE is 0, the TxD pin is used as an I/O port whose direction (input or output) and level are
determined by DR and DDR. This can be used to set the TxD pin to mark state (high level) or send
a break during serial data transmission. To maintain the communication line at mark state until TE
is set to 1, set both DDR and DR to 1. As TE is cleared to 0 at this point, the TxD pin becomes an
I/O port, and 1 is output from the TxD pin. To send a break during serial transmission, first set
PCR to 1 and PDR to 0, and then clear TE to 0. When TE is cleared to 0, the transmitter is
initialized regardless of the current transmission state, the TxD pin becomes an I/O port, and 0 is
output from the TxD pin.
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