Sci Interrupts - Renesas F-ZTAT H8 Series Hardware Manual

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Section 13 Serial Communication Interface

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

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.

The DMAC can be activated by interrupts from SCI channel 0.

Table 13.12 SCI Interrupt Sources

Receive error (ORER, FER, or PER)

Receive data register full (RDRF)

Transmit data register empty (TDRE)

Transmit end (TEND)

Rev. 3.00 Mar 21, 2006 page 488 of 814

REJ09B0302-0300