SH7144_08 Datasheet, PDF (162/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

8. Data Transfer Controller (DTC)
8.2.2 DTC Source Address Register (DTSAR)
The DTC source address register (DTSAR) is a 32-bit register that specifies the DTC transfer
source address. For the word size transfer, specify an even source address. For the longword size
transfer, specify a multiple-of-four address.
The initial value of DTSAR is undefined.
8.2.3 DTC Destination Address Register (DTDAR)
The DTC destination address register (DTDAR) is a 32-bit register that specifies the DTC transfer
destination address. For the word size transfer, specify an even source address. For the longword
size transfer, specify a multiple-of-four address.
The initial value of DTDAR is undefined.
8.2.4 DTC Initial Address Register (DTIAR)
The DTC initial address register (DTIAR) is a 32-bit register that specifies the initial transfer
source/transfer destination address in repeat mode. In repeat mode, when the DTS bit is set to 1,
specify the initial transfer source address in the repeat area, and when the DTS bit is cleared to 0,
specify the initial transfer destination address in the repeat area.
The initial value of DTIAR is undefined.
8.2.5 DTC Transfer Count Register A (DTCRA)
DTCRA is a 16-bit register that designates the number of times data is to be transferred by the
DTC.
In normal mode, the DTCRA functions as a 16-bit transfer counter (1 to 65536). It is decremented
by 1 every time data is transferred, and transfer ends when the count reaches H'0000. The number
of transfers is 1 when the set value is H'0001, 65535 when it is H'FFFF, and 65536 when it is
H'0000.
In repeat mode, upper 8-bit DTCRAH maintains the transfer count value and lower 8-bit
DTCRAL functions as an 8-bit transfer counter. The number of transfers is 1 when the set value is
DTCRAH = DTCRAL = H'01, 255 when they are H'FF, and 256 when it is H'00.
In block transfer mode, the DTCRA functions as a 16-bit transfer counter. The number of transfers
is 1 when the set value is H'0001, 65535 when it is H'FFFF, and 65536 when it is H'0000.
Rev.4.00 Mar. 27, 2008 Page 118 of 882
REJ09B0108-0400