H8SLASH3003 datasheet(495/715 Pages) RENESAS

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13.4 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 13-12

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 TXI interrupt request can activate the

DMAC to transfer data. Data transfer by the DMAC automatically clears the TDRE flag to 0. The

TEI interrupt request cannot activate the DMAC.

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. The RXI interrupt request can

activate the DMAC to transfer data. Data transfer by the DMAC automatically clears the RDRF

flag to 0. The ERI interrupt request cannot activate the DMAC.

DMAC channels in group 0 can be activated by interrupts from SCI channel 0. DMAC channels in

group 1 can be activated by interrupts from SCI channel 1.

Table 13-12 SCI Interrupt Sources

Interrupt

Description

Priority

ERI

Receive error (ORER, FER, or PER)

High

RXI

Receive data register full (RDRF)

TXI

Transmit data register empty (TDRE)

TEI

Transmit end (TEND)

Low

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