HD6417618 datasheet(394/646 Pages) RENESAS

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Section 14 Serial Communication Interface with FIFO (SCIF)

Rev. 6.00 Jun. 12, 2007 Page 362 of 610

REJ09B0131-0600

14.4

Operation

14.4.1

Overview

For serial communication, the SCIF has an asynchronous mode in which characters are

synchronized individually, and a synchronous mode in which communication is synchronized with

clock pulses. The SCIF has a 16-byte FIFO buffer for both transmit and receive operations,

reducing the overhead of the CPU, and enabling continuous high-speed communication.

Moreover, it has

RTS and CTS signals as modem control signals (for channels 0 and 1). The

transmission format is selected in the serial mode register (SCSMR). The SCIF clock source is

selected by the combination of the CKE1 and CKE0 bits in the serial control register (SCSCR).

Asynchronous Mode:

• Data length is selectable: 7 or 8 bits.

• Parity bit is selectable. So is the stop bit length (1 or 2 bits). The combination of the preceding

selections constitutes the communication format and character length.

• In receiving, it is possible to detect framing errors, parity errors, receive FIFO data full,

overrun errors, receive data ready, and breaks.

• The number of stored data bytes is indicated for both the transmit and receive FIFO registers.

• An internal or external clock can be selected as the SCIF clock source.

 When an internal clock is selected, the SCIF operates using the on-chip baud rate

generator.

 When an external clock is selected, the external clock input must have a frequency 16 times

the bit rate. (The on-chip baud rate generator is not used.)

Synchronous Mode:

• The transmission/reception format has a fixed 8-bit data length.

• In receiving, it is possible to detect overrun errors (ORER).

• An internal or external clock can be selected as the SCIF clock source.

 When an internal clock is selected, the SCIF operates using the on-chip baud rate

generator, and outputs a serial clock signal to external devices.

 When an external clock is selected, the SCIF operates on the input serial clock. The on-

chip baud rate generator is not used.

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