YR0K42378FC000BA Renesas Electronics America, YR0K42378FC000BA Datasheet - Page 451
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: 451 of 1208
- Download datasheet (8Mb)
Caution is required when setting the repeat area overflow interrupt of the repeat area function in
block transfer mode. See section 8.4.6, Repeat Area Function, for details.
Block transfer is aborted if an NMI interrupt is generated. See section 8.4.12, Ending DMA
Transfer, for details.
Figure 8.8 shows an example of DMA transfer timing in block transfer mode.
8.4.6
The EXDMAC has a function for designating a repeat area for source addresses and/or destination
addresses. When a repeat area is designated, the address register values repeat within the range
specified as the repeat area. Normally, when a ring buffer is involved in a transfer, an operation is
required to restore the address register value to the buffer start address each time the address
register value is the last address in the buffer (i.e. when ring buffer address overflow occurs), but if
the repeat area function is used, the operation that restores the address register value to the buffer
start address is performed automatically within the EXDMAC.
The repeat area function can be set independently for the source address register and the
destination address register.
Transfer conditions:
EDREQ
EDRAK
Bus cycle
ETEND
· Single address mode
· BGUP = 0
· Block size (EDTCR[23:16]) = 3
Repeat Area Function
CPU
Figure 8.8 Example of Timing in Block Transfer Mode
CPU
CPU
EXDMAC
One-block transfer cycle
CPU cycle not generated
Rev.7.00 Mar. 18, 2009 page 383 of 1136
EXDMAC
Section 8 EXDMA Controller (EXDMAC)
EXDMAC
REJ09B0109-0700
CPU
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