H8SX1663 datasheet(788/1158 Pages) RENESAS

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Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 736 of 1102

REJ09B0294-0100

15.9

Interrupt Sources

15.9.1

Interrupts in Normal Serial Communication Interface Mode

Table 15.14 shows the interrupt sources in normal serial communication interface mode. A

different interrupt vector is assigned to each interrupt source, and individual interrupt sources can

be enabled or disabled using the enable bits in SCR.

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 request can activate the

DTC or DMAC to allow data transfer. The TDRE flag is automatically cleared to 0 at data transfer

by the DTC or DMAC.

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 DTC or DMAC to allow data transfer. The RDRF flag is automatically cleared to 0 at

data transfer by the DTC or DMAC.

A TEI interrupt is requested when the TEND flag is set to 1 while the TEIE bit is set to 1. If a TEI

interrupt and a TXI interrupt are requested simultaneously, the TXI interrupt has priority for

acceptance. However, note that if the TDRE and TEND flags are cleared to 0 simultaneously by

the TXI interrupt processing routine, the SCI cannot branch to the TEI interrupt processing routine

later.

Note that the priority order for interrupts is different between the group of SCI_0, 1, 2, and 4 and

the group of SCI_5 and SCI_6.

Table 15.14 SCI Interrupt Sources (SCI_0, 1, 2, and 4)

Name

Interrupt Source

Interrupt Flag

DTC Activation

DMAC Activation

Priority

ERI

Receive error

ORER, FER, or PER

Not possible

High

RXI

Receive data full

RDRF

Possible

TXI

Transmit data empty TDRE

Possible

TEI

Transmit end

TEND

Not possible

Low

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