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MSP430F5438A替换5438程序跑飞

Other Parts Discussed in Thread: MSP430F5438

以前用MSP430F5438开发的设备稳定运行几年了,现在想用5438A替代,硬件和程序都没有修改。用到的资源是定时器和串口。用5438A一运行程序就跑飞。不是5438A可以完全替代5438吗?现在找不到什么原因。请专家提供点建议,IAR版本是4.21。