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H8S/2214 Scheda tecnica(PDF) 287 Page - Renesas Technology Corp

Il numero della parte H8S/2214
Spiegazioni elettronici  16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series
PDF  936 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S/2214 Scheda tecnica(HTML) 287 Page - Renesas Technology Corp

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Section 7 DMA Controller
Rev.4.00 Sep. 18, 2008 Page 227 of 872
REJ09B0189-0400
ETCRAL is decremented by 1 each time a byte or word transfer is performed. In response to a
single transfer request, burst transfer is performed until the value in ETCRAL reaches H'00.
ETCRAL is then loaded with the value in ETCRAH. At this time, the value in the MAR register
for which a block designation has been given by the BLKDIR bit in DMACRA is restored in
accordance with the DTSZ, SAID/DAID, and SAIDE/DAIDE bits in DMACR.
ETCRB is decremented by 1 every block transfer, and when the count reaches H'0000 the DTE bit
is cleared and transfer ends. If the DTIE bit is set to 1 at this point, an interrupt request is sent to
the CPU or DTC.
Figure 7.13 shows the operation flow in block transfer mode.



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