YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 450
YR0K42378FC000BA
Manufacturer Part Number
YR0K42378FC000BA
Description
KIT EVAL FOR H8S/2378
Manufacturer
Renesas Electronics America
Series
H8®r
Type
MCUr
Datasheet
1.YR0K42378FC000BA.pdf
(1208 pages)
Specifications of YR0K42378FC000BA
Contents
Board
For Use With/related Products
H8S/2378
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
- Current page: 450 of 1208
- Download datasheet (8Mb)
Section 8 EXDMA Controller (EXDMAC)
Block Transfer Mode: In block transfer mode, the number of bytes or words specified by the
block size is transferred in response to one transfer request. The upper 8 bits of EDTCR specify
the block size, and the lower 16 bits function as a 16-bit transfer counter. A block size of 1 to 256
can be specified. During transfer of a block, transfer requests for other higher-priority channels are
held pending. When transfer of one block is completed, the bus is released in the next cycle.
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 block transfer.
Address register values are updated in the same way as in normal mode. There is no function for
restoring the initial address register values after each block transfer.
The ETEND signal is output for each block transfer in the DMA transfer cycle in which the block
ends. The EDRAK signal is output once for one transfer request (for transfer of one block).
Rev.7.00 Mar. 18, 2009 page 382 of 1136
REJ09B0109-0700
Transfer conditions:
Transfer conditions:
Bus cycle
ETEND
EDREQ
EDRAK
Bus cycle
EDACK
Dual address mode, auto request mode
Single address mode, external request mode
Figure 8.7 Examples of Timing in Normal Transfer Mode
Read
transfer cycle
EXDMA
Write
EXDMA
Read
Last EXDMA
transfer cycle
EXDMA
Write
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