YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 449

Manufacturer Part Number

YR0K42378FC000BA

KIT EVAL FOR H8S/2378

Manufacturer

Renesas Electronics America

For Use With/related Products

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

When the BGUP bit is set to 1 in EDMDR, the bus is released if a bus request is issued by another

bus master during burst transfer. If there is no bus request, burst transfer is executed even if the

BGUP bit is set to 1.

Figure 8.6 shows examples of the timing in burst mode.

There are two transfer modes: normal transfer mode and block transfer mode. When the activation

source is an external request, either normal transfer mode or block transfer mode can be selected.

When the activation source is an auto request, normal transfer mode is used.

Normal Transfer Mode: In normal transfer mode, transfer of one transfer unit is processed in

response to one transfer request. EDTCR functions as a 24-bit transfer counter.

The ETEND signal is output only for the last DMA transfer. The EDRAK signal is output each

time a transfer request is accepted and transfer processing is started.

Figure 8.7 shows examples of DMA transfer timing in normal transfer mode.

Transfer conditions:

Auto request mode, BGUP = 0

Auto request mode, BGUP = 1

Transfer Modes

Figure 8.6 Examples of Timing in Burst Mode

EXDMAC operates alternately with CPU

CPU cycle not generated

Rev.7.00 Mar. 18, 2009 page 381 of 1136

Section 8 EXDMA Controller (EXDMAC)

REJ09B0109-0700