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R01UH0336EJ0102 Rev.1.02
Page 234 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 5 DMA Module
5.6.4
Conditions for Validity of DMA Transfer Requests
Whether a request for DMA transfer on channel n is or is not acknowledged
depends on the setting of the DTRC0ERR and DTRC0ADS bits of the DMA
transfer request control register (DTRC0), the DTCTnMLE bit of the DMA
transfer control register (DTCTn), and the DTSnTC and DTSnDTE bits of the
DMA transfer status register (DTSn). The following table lists the relationship
between the settings of these bits and whether a DMA transfer request is or is
not acknowledged.
Note
n = 0 to 7
Table 5-6
Conditions for Validity of Requests for DMA Transfer on Channel n
Register.Bit Name
DTSn.
DTSnDTE
DTSn.
DTSnTC
DTCTn.
DTCTnMLE
DTRC0.
DTRC0ERR
DTRC0.
DTRC0ADS
DMA
Transfer
Request
When DMA transfer is
disabled
0
X
X
X
X
Invalid
When DMA transfer error
occurs
X
X
X
1
X
Invalid
When DMA transfer is
suspended
X
X
X
X
1
Invalid
When DMA transfer is
completed (multilink disabled)
X
1
0
X
X
Invalid
When DMA transfer is
completed/not completed
(multilink enabled)
1
X
1
0
0
Valid
When DMA transfer is
enabled
1
0
0
0
0
Valid
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