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MAP430F149芯片串口通信问题

在F149芯片应用时使用了其中的两个串口进行通讯,现在想增加通讯的串口数量,不知道 F149芯片能不能进行端口功能的扩展,若能,怎样实现?另外怎样在外部扩展 ROM区,具体怎么实现,请指教!