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TI-RTOS seconds模块精度问题

#include<ti/sysbios/hal/Seconds.h>

seconds模块的API说Seconds可以精确到纳秒。是不是真的?launchpad上晶振最大才48MHz。

typedef struct Seconds_Time {
    UInt32 secs;
    // Seconds
    UInt32 nsecs;
    // Nanoseconds
} Seconds_Time;