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MSP430I2040: MSP430I2040中断嵌套问题

Part Number: MSP430I2040

我想达到的目的是让定时器1中断的优先级最高,然后可以打断其他的中断,我总共开了四个中断,串口、ADC、两个定时器,但是我只要在串口和ADC中断里面再次打开总中断,就会导致串口数据接收错误,通讯不上。并不能达到我想要的中断嵌套的效果。关于这方面的问题想请教一下。