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MSP430F449怎么扩展RAM

在用449做三相加窗插值FFT算法时,出现RAM不够的情况。IAR提示0x1114bytes needed,程序用了6418bytes的DATA memory,就是用了6.26KB的RAM.

我定义了float型大数组x[256],是256*4=1KB,共定义了6个这样的数组。程序是优化不了啦,只能扩展RAM.

请问449能外扩RAM么?怎么扩展RAM?