SH7101 datasheet(356/486 Pages) RENESAS

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10. Serial Communication Interface (SCI)

Rev.2.00 Sep. 27, 2007 Page 322 of 448

REJ09B0394-0200

10.7

Interrupts Sources

10.7.1

Interrupts in Normal Serial Communication Interface Mode

Table 10.10 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.

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.

A TEI interrupt is generated 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 generated simultaneously, the TXI interrupt has priority for

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

TXI interrupt routine, the SCI cannot branch to the TEI interrupt routine later.

Table 10.10 SCI Interrupt Sources

Channel

Name

Interrupt Source

Interrupt Flag

ERI_2

Receive Error

ORER, FER, PER

RXI_2

Receive Data Full

RDRF

TXI_2

Transmit Data Empty

TDRE

TEI_2

Transmission End

TEND

ERI_3

Receive Error

ORER, FER, PER

RXI_3

Receive Data Full

RDRF

TXI_3

Transmit Data Empty

TDRE

TEI_3

Transmission End

TEND

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