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SH7041A датащи(PDF) 258 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 258 Page - Renesas Technology Corp |
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258 / 923 page ![]() 220 11.2.3 DMA Transfer Count Registers 0–3 (DMATCR0–DMATCR3) DMA transfer count registers 0–3 (DMATCR0–DMATCR3) are 24-bit read/write registers that specify the transfer count for the channel (byte count, word count, or longword count). Specifying a H'000001 gives a transfer count of 1, while H'000000 gives the maximum setting, 16,777,216 transfers. The data for the upper 8 bits of a DMATCR is 0 when read. Always write 0. The initial value after power-on resets or in software standby mode is undefined. These registers are not initialized with manual reset. Always write 0 to the upper 8 bits of a DMATCR. Bit: 31 30 29 28 27 26 25 24 —— —— ——— — Initial value: — — — — — — — — R/W: R R R R R R R R Bit: 23 22 21 20 19 18 17 16 Initial value: — — — — — — — — R/W: R/W R/W R/W R/W R/W R/W R/W R/W Bit: 15 14 13 12 11 10 9 8 Initial value: — — — — — — — — R/W: R/W R/W R/W R/W R/W R/W R/W R/W Bit: 7 6 5 4 3 2 1 0 Initial value: — — — — — — — — R/W: R/W R/W R/W R/W R/W R/W R/W R/W |
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