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H8SX1663 Scheda tecnica(PDF) 377 Page - Renesas Technology Corp |
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H8SX1663 Scheda tecnica(HTML) 377 Page - Renesas Technology Corp |
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377 / 1158 page ![]() Section 7 DMA Controller (DMAC) Rev.1.00 Jun. 07, 2006 Page 325 of 1102 REJ09B0294-0100 7.3.4 DMA Transfer Count Register (DTCR) DTCR is a 32-bit readable/writable register that specifies the size of data to be transferred (total transfer size). To transfer 1-byte data in total, set H'00000001 in DTCR. When H'00000000 is set in this register, it means that the total transfer size is not specified and data is transferred with the transfer counter stopped (free running mode). When H'FFFFFFFF is set, the total transfer size is 4 Gbytes (4,294,967,295), which is the maximum size. While data is being transferred, this register indicates the remaining transfer size. The value corresponding to its data access size is subtracted every time data is transferred (byte: −1, word: −2, and longword: −4). Although DTCR can always be read from by the CPU, it must be read from in longwords and must not be written to while data for the channel is being transferred. 31 0 R/W 30 0 R/W 29 0 R/W 28 0 R/W 27 0 R/W 24 0 R/W 26 0 R/W 25 0 R/W Bit Bit Name Initial Value R/W 23 0 R/W 22 0 R/W 21 0 R/W 20 0 R/W 19 0 R/W 16 0 R/W 18 0 R/W 17 0 R/W Bit Bit Name Initial Value R/W 15 0 R/W 14 0 R/W 13 0 R/W 12 0 R/W 11 0 R/W 8 0 R/W 10 0 R/W 9 0 R/W Bit Bit Name Initial Value R/W 7 0 R/W 6 0 R/W 5 0 R/W 4 0 R/W 3 0 R/W 0 0 R/W 2 0 R/W 1 0 R/W Bit Bit Name Initial Value R/W |
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