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请问这个时间应该如何计算呢

用的是5509,这是个延时函数:
void delay(int a){
Config1.prd=a*20;
SetClock();
while(!IRQ_test(IRQ_EVT_TINT1));
Config1.prd=0x270f;//07d0;//4E1F; 
}
但是不知道这个代表延时多久,时钟频率是192MHZ