Sci Interrupts; Table 12.12 Sci Interrupt Sources - Hitachi H8/3062 Hardware Manual

12.4

SCI Interrupts

The SCI has four interrupt request sources: transmit-end interrupt (TEI), receive-error (ERI),
receive-data-full (RXI), and transmit-data-empty interrupt (TXI). Table 12.12 lists the interrupt
sources and indicates their priority. These interrupts can be enabled or disabled by the TIE, RIE,
and TEIE bits in SCR. Each interrupt request is sent separately to the interrupt controller.
A TXI interrupt is requested when the TDRE flag is set to 1 in SSR. A TEI interrupt is requested
when the TEND flag is set to 1 in SSR.
An RXI interrupt is requested when the RDRF flag is set to 1 in SSR. An ERI interrupt is
requested when the ORER, PER, or FER flag is set to 1 in SSR.

Table 12.12 SCI Interrupt Sources

Interrupt Source
ERI
RXI
TXI
TEI
Description
Receive error (ORER, FER, or PER)
Receive data register full (RDRF)
Transmit data register empty (TDRE)
Transmit end (TEND)
Priority
High
Low
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