说明：  演示了如何操作MSP430F149单片机的DMA操作
( Description: A 16 word block from 220h-240h is transfered to 240h-260h using DMA0 in a burst block using software DMAREQ trigger. After each transfer, source, destination and DMA size are reset to inital software setting because DMA transfer mode 5 is used. P1.0 is toggled durring DMA transfer only for demonstration purposes. * RAM location 0x220- 0x260 used- always make sure no compiler conflict*)