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如何实现TMS320VC5509A的引脚定义

如何在tms320v5509a实现如同51单片机的定义?

比如在51单片机中:

sbit CS =P1^7;
sbit RES=P1^6;
sbit RS =P1^0; 
sbit RW =P1^1;

在5509a里怎么定义?