Sci Interrupts - Hitachi H8/3032 Series Hardware Manual

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11.4 SCI Interrupts

The SCI has four interrupt request sources: TEI (transmit-end interrupt), ERI (receive-error
interrupt), RXI (receive-data-full interrupt), and TXI (transmit-data-empty interrupt). Table 11-12
lists the interrupt sources and indicates their priority. These interrupts can be enabled and disabled
by the TIE, TEIE, and RIE bits in SCR. Each interrupt request is sent separately to the interrupt
controller.
The TXI interrupt is requested when the TDRE flag is set to 1 in SSR. The TEI interrupt is
requested when the TEND flag is set to 1 in SSR.
The RXI interrupt is requested when the RDRF flag is set to 1 in SSR. The ERI interrupt is
requested when the ORER, PER, or FER flag is set to 1 in SSR.
Table 11-12 SCI Interrupt Sources
Interrupt Description
ERI Receive error (ORER, FER, or PER)
RXI Receive data register full (RDRF)
TXI Transmit data register empty (TDRE)
TEI Transmit end (TEND)
Priority
High
Low
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