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Rev. 1.00, 05/04, page 271 of 544
12.7 Interrupt Sources
Table 12.10 shows the interrupt sources in serial communication interface. A different interrupt
vector is assigned to each interrupt source, and individual interrupt sources can be enabled or
disabled using the enable bits in SCR.
When the TDRE flag in SSR is set to 1, a TXI interrupt request is generated. When the TEND flag
in SSR is set to 1, a TEI interrupt request is generated.
When the RDRF flag in SSR is set to 1, an RXI interrupt request is generated. When the ORER,
PER, or FER flag in SSR is set to 1, an ERI interrupt request is generated.
A TEI interrupt is requested when the TEND flag is set to 1 while the TEIE bit is set to 1. If a TEI
interrupt and a TXI interrupt are requested simultaneously, the TXI interrupt has priority for
acceptance. However, note that if the TDRE and TEND flags are cleared simultaneously by the
TXI interrupt routine, the SCI cannot branch to the TEI interrupt routine later.
Table 12.10 SCI Interrupt Sources
Channel Name Interrupt Source Interrupt Flag Priority
ERI1 Receive error ORER, FER, PER
RXI1 Receive data full RDRF
TXI1 Transmit data empty TDRE
High
1
TEI1 Transmit end TEND Low