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TMS320F280021: 请问F2802x与F28002x的差别,如何选型?

Part Number: TMS320F280021

看参数F28002x主频120M,跟F2802x对比,主频高,带FPU,带CLB,而且官网价格还便宜,还有货,有点疑惑,有其他方面性能不如老系列的吗?那这样的话microchip的dsPIC33系列就完全没生存空间了啊,哪位了解细节的帮忙解析解析