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HD6432351 датащи(PDF) 290 Page - Renesas Technology Corp |
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HD6432351 датащи(HTML) 290 Page - Renesas Technology Corp |
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290 / 1025 page ![]() Section 7 DMA Controller (DMAC) Rev. 3.00 Sep 15, 2006 page 256 of 988 REJ09B0330-0300 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 7.15 shows the operation flow in block transfer mode. |
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