R0K572115S000BE Renesas Electronics America, R0K572115S000BE Datasheet - Page 368

• Manufacturer Part Number: R0K572115S000BE
• Description: KIT STARTER FOR SH7211
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: Microcontrollerr

Specifications of R0K572115S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7211
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

(b)
In burst mode, once the DMAC obtains the bus mastership, it does not release the bus mastership
and continues to perform transfer until the transfer end condition is satisfied. In external request
mode with low level detection of the DREQ pin, however, when the DREQ pin is driven high, the
bus mastership is passed to another bus master after the DMAC transfer request that has already
been accepted ends, even if the transfer end conditions have not been satisfied.
Figure 9.11 shows DMA transfer timing in burst mode.
(3)
Table 9.10 shows the relationship between request modes and bus modes by DMA transfer
category.
Rev. 3.00 Mar. 04, 2009 Page 342 of 1168
REJ09B0344-0300
Burst Mode
Relationship between Request Modes and Bus Modes by DMA Transfer Category
Bus cycle
DREQ
Figure 9.11 DMA Transfer Example in Burst Mode
(Dual Address, DREQ Low Level Detection)
CPU
CPU
CPU
DMAC DMAC DMAC DMAC
Read
Write
Read
Write
CPU
CPU