SH7144 Datasheet, PDF (192/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

• DMA destination address register_3 (DAR_3)
• DMA transfer count register_3 (DMATCR_3)
• DMA channel control register_3 (CHCR_3)
• DMA operation register (DMAOR)
10.3.1 DMA Source Address Registers_0 to 3 (SAR_0 to SAR_3)
DMA source address registers_0 to 3 (SAR_0 to SAR_3) are 32-bit readable/writable registers
that specify the source address of a DMA transfer. These registers have a count function, and
during a DMA transfer, they indicate the next source address. In single-address mode, SAR values
are ignored when a device with DACK has been specified as the transfer source.
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 addresses.
When this register is accessed in 16 bits, the value of another 16 bits that are not accessed is
retained.
The initial value of SAR is undefined.
10.3.2 DMA Destination Address Registers_0 to 3 (DAR_0 to DAR_3)
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.
Rev. 2.0, 09/02, page 152 of 732