HD6432351 datasheet(638/1025 Pages) RENESAS

638 / 1025 page

Section 13 Serial Communication Interface (SCI)

Rev. 3.00 Sep 15, 2006 page 604 of 988

REJ09B0330-0300

13.4

SCI Interrupts

The SCI has four interrupt sources: the transmit-end interrupt (TEI) request, receive-error interrupt

(ERI) request, receive-data-full interrupt (RXI) request, and transmit-data-empty interrupt (TXI)

request. Table 13.12 shows the interrupt sources and their relative priorities. Individual interrupt

sources can be enabled or disabled with the TIE, RIE, and TEIE bits in the SCR. Each kind of

interrupt request is sent to the interrupt controller independently.

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. A TXI interrupt can activate the DMAC or

DTC to perform data transfer. The TDRE flag is cleared to 0 automatically when data transfer is

performed by the DMAC or DTC. The DMAC and DTC cannot be activated by a TEI interrupt

request.

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. An RXI interrupt can

activate the DMAC or DTC to perform data transfer. The RDRF flag is cleared to 0 automatically

when data transfer is performed by the DMAC or DTC. The DMAC and DTC cannot be activated

by an ERI interrupt request.

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