SH7721 datasheet(667/1524 Pages) RENESAS

667 / 1524 page

Section 18

Serial Communication Interface with FIFO (SCIF)

Rev. 3.00 Jan. 18, 2008 Page 605 of 1458

REJ09B0033-0300

Bit

Bit Name Initial Value R/W

Description

RDF

R/(W)*

Receive FIFO Data Full

Indicates that received data is transferred to the

receive FIFO data register (SCFRDR), the number of

data in SCFRDR becomes more than the number of

receive triggers specified by the RTRG1 and RTRG0

bits in SCFCR.

0: The number of transmit data written to SCFRDR is

less than the specified number of receive triggers

[Clearing conditions]

• Power-on reset, manual reset

• SCFRDR is read until the number of receive data

in SCFRDR becomes less than the specified

number of receive triggers, and RDF is read as 1,

then written to with 0.

1: The number of receive data in SCFRDR is more

than the specified number of receive triggers

[Setting condition]

The number of receive data which is greater than the

specified number of receive triggers is being stored to

SCFRDR.*

Note:

Since SCFTDR is a 64-byte FIFO

which can be read when RDF is 1 is the

specified number of receive triggers. If

attempted to read after all data in

SCFRDR have been read, the data is

undefined. The number of receive data in

SCFRDR is indicated by the lower bits of

SCFTDR.

SH7721 Datasheet(PDF) 667 Page - Renesas Technology Corp