HD6417618 datasheet(631/646 Pages) RENESAS

631 / 646 page

Rev. 6.00 Jun. 12, 2007 Page 599 of 610

REJ09B0131-0600

Main Revisions and Additions in this Edition

Item

Page Revision (See Manual for Details)

1. Auto-refreshing

175

Amended

set so as to satisfy the SDRAM refreshing cycle time

(tRC). A Tpw cycle is inserted between the Tp cycle

and Trr cycle when the setting of bits WTRP1 and

WTRP0 in CSnWCR is longer than or equal to one

cycle.

Amended

Mode

Description

Transmit FIFO Data Empty

Indicates that data has been transferred from the transmit FIFO

data register (SCFTDR) to the transmit shift register (SCTSR), the

quantity of data in SCFTDR has become less than the transmission

trigger number specified by the TTRG1 and TTRG0 bits in the FIFO

control register (SCFCR), and writing of transmit data to SCFTDR is

enabled.

0: The quantity of transmit data written to SCFTDR is greater than

the specified transmission trigger number

[Clearing conditions]

•

TDFE is cleared to 0 when data exceeding the specified

transmission trigger number is written to SCFTDR after 1 is

read from TDFE and then 0 is written

•

TDFE is cleared to 0 when DMAC write data exceeding the

specified transmission trigger number to SCFTDR

1: The quantity of transmit data in SCFTDR is equal to or less than

the specified transmission trigger number*

[Setting conditions]

•

TDFE is set to 1 by a power-on reset

•

TDFE is set to 1 when the quantity of transmit data in

SCFTDR has become equal to or less than the specified

transmission trigger number as a result of transmission

Note: *

Since SCFTDR is a 16-byte FIFO register, the

maximum quantity of data that can be written when TDFE is 1 is "16

minus the specified transmission trigger number". If an attempt is

made to write additional data, the data is ignored. The quantity of

data in SCFTDR is indicated by the upper 8 bits of SCFDR.

14.3.7 Serial Status Register

(SCFSR)

341

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