Rev. 1.0, 09/01, page 321 of 904
8.3.3
EXDMA Transfer Count Register (EDTCR)
EDTCR specifies the number of transfers. The function differs according to the transfer mode. Do
not write to EDTCR for a channel on which EXDMA transfer is in progress.
Normal Transfer Mode:
Bit
Bit Name
Initial Value
R/W
Description
31
to
24
—
0
—
Reserved
These bits are always read as 0 and cannot be
modified.
23
to
0
0
R/W
24-Bit Transfer Counter
These bits specify the number of transfers.
Setting H'000001 specifies one transfer. Setting
H'000000 means no specification for the
number of transfers, and the transfer counter
function is halted. In this case, there is no
transfer end interrupt by the transfer counter.
Setting H'FFFFFF specifies the maximum
number of transfers, that is 16,777,215. During
EXDMA transfer, this counter shows the
remaining number of transfers.
This counter can be read at all times. When
reading EDTCR for a channel on which EXDMA
transfer processing is in progress, a longword-
size read must be executed.
Содержание H8S/2376 F-ZTAT
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