SH7713 datasheet(623/904 Pages) RENESAS

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Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 583 of 860

REJ09B0288-0150

Table 16.6

The SCIF Interrupt Sources

Interrupt

Source

Description

DMAC

Activation

Priority on Reset

Release

ERI

Interrupt initiated by receive error (ER) Not possible

High

RXI

Interrupt initiated by receive FIFO data

full (RDF) or data ready (DR)*

Possible

BRI

Interrupt initiated by break (BRK) or

overrun error (ORER)

Not possible

TXI

Interrupt initiated by transmit FIFO

data empty (TDFE)

Possible

Low

Note:

The RXI by the DR is enabled only in asynchronous mode.

See section 4, Exception Handling, for priorities and the relationship with non-the SCIF

interrupts.

16.6

Usage Notes

Note the following when using the SCIF.

SCFTDR Writing and TDFE Flag: The TDFE flag in SCFSR is set when the number of

transmit data bytes written in SCFTDR has fallen to or below the transmit trigger number set by

bits TTRG1 and TTRG0 in SCFCR. After the TDFE flag is set, transmit data up to the number of

empty bytes in SCFTDR can be written, allowing efficient continuous transmission.

However, if the number of data bytes written in SCFTDR is equal to or less than the transmit

trigger number, the TDFE flag will be set to 1 again after being read as 1 and cleared to 0. TDFE

clearing should therefore be carried out when SCFTDR contains more than the transmit trigger

number of transmit data bytes.

The number of transmit data bytes in SCFTDR can be found from bits 12 to 8 in SCFDR.

SCFRDR Reading and RDF Flag: The RDF flag in SCFSR is set when the number of receive

data bytes in SCFRDR has become equal to or greater than the receive trigger number set by bits

RTRG1 and RTRG0 in SCFCR. After the RDF flag is set, receive data equivalent to the trigger

number can be read from SCFRDR, allowing efficient continuous reception.

However, if the number of data bytes in SCFRDR is still equal to or greater than the trigger

number after a read, the RDF flag will be set to 1 again if it is cleared to 0. The RDF flag should

therefore be cleared to 0 after being read as 1 after all receive data has been read.

The number of receive data bytes in SCFRDR can be found from bits 4 to 0 in SCFDR.

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