HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 215
HD6417144
Manufacturer Part Number
HD6417144
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417144.pdf
(930 pages)
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10.3.2
DMA destination address registers_0 to 3 (DAR_0 to DAR_3) are 32-bit readable/writable
registers that specify the destination address of a DMA transfer. These registers have a count
function, and during a DMA transfer, they indicate the next destination address. In single-address
mode, DAR values are ignored when a device with DACK has been specified as the transfer
destination.
Specify a 16-bit or 32-bit boundary address when doing 16-bit or 32-bit data transfers. Operation
cannot be guaranteed on any other address. When this register is accessed in 16 bits, the value of
another 16 bits that are not accessed is retained.
The initial value of DAR is undefined.
10.3.3
DMA transfer count registers_0 to 3 (DMATCR_0 to DMATCR_3) are 32-bit readable/writable
registers that specify the transfer count for each channel (byte count, word count, or longword
count) with lower 24 bits. Specifying a H'000001 gives a transfer count of 1, while H'000000
gives the maximum setting, 16,777,216 transfers. While DMAC is in operation, the number of
transfers to be performed is indicated.
Upper eight bits of this register are read as 0 and the write value should always be 0. When this
register is accessed in 16 bits, the value of another 16 bits that are not accessed is retained.
The initial value of DMATCR is undefined.
DMA Destination Address Registers_0 to 3 (DAR_0 to DAR_3)
DMA Transfer Count Registers_0 to 3 (DMATCR_0 to DMATCR_3)
10. Direct Memory Access Controller (DMAC)
Rev.4.00 Mar. 27, 2008 Page 171 of 882
REJ09B0108-0400
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