H8SSLASH2214 datasheet(578/936 Pages) RENESAS

578 / 936 page

Section 12 Serial Communication Interface (SCI)

Rev.4.00 Sep. 18, 2008 Page 518 of 872

REJ09B0189-0400

12.4

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 12.13 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 or 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 or DTC cannot be activated

by an ERI interrupt request.

Note : * The flag is cleared when DISEL is 0 and furthermore the transfer counter is not 0.

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