SH7713 datasheet(599/904 Pages) RENESAS

599 / 904 page

Section 16 Serial Communication Interface with FIFO (SCIF)

Rev.1.50 Aug. 30, 2006 Page 559 of 860

REJ09B0288-0150

16.4

Operation

16.4.1

Overview

The SCIF can carry out serial communication in asynchronous mode, in which synchronization is

achieved character by character, and in clock synchronous mode, in which synchronization is

achieved with clock pulses.

16-stage FIFO buffers are provided for both transmission and reception, reducing the CPU

overhead and enabling fast, continuous communication to be performed. Also, the

RTS and CTS

signals are included as modem control signals. Transfer format is selected by SCSMR. This is

shown in table 16.3. The SCIF clock source is determined by the combination of the C/

A bit in

SCSMR and the CKE1 and CKE0 bits in SCSCR. This is shown in table 16.4.

Asynchronous Mode

• Data length: Choice of 7 or 8 bits

• Choice of parity addition and addition of 1 or 2 stop bits (the combination of these parameters

determines the transfer format and character length)

• Detection of framing errors, parity errors, overrun errors, receive-FIFO-data-full state, receive-

data-ready state, and breaks, during reception

• Indication of the number of data bytes stored in the transmit and receive FIFO registers

• The SCIF clock source: Choice of internal or external clock

When internal clock is selected: The SCIF operates on the baud rate generator clock.

When external clock is selected: Clock with frequency16 times the bit rate must be input. (The

on-chip baud rate generator is not used.)

Clock synchronous Mode

• Transfer format: Fixed to 8-bit data

• Detection of overrun errors during reception

• The SCIF clock source: Choice of internal or external clock

When internal clock is selected: The SCIF operates on the baud rate generator clock and

outputs the synchronous clock

When external clock is selected: The SCIF operates on the input synchronous clock. The on-

chip baud rate generator is not used.

SH7713 Datasheet(PDF) 599 Page - Renesas Technology Corp